Sir is wale video m na at 1:31:55 sir ne g negative liya hua h,
jab body niche ki taraf ati h tab g positive hota h
So there's a correction here.
Infact, At 1:26:32 even sir said that when body moves upwards g is -ve
At 00:11:26 sir indirectly said that when m2 block is moving downward, the value of g is +ve hence he wrote net driving force = m2g and not -m2g
Q.1- A stone falls freely under gravity It covers distances h1,h2 and h3 in the first 5 second, the next 5 second and the next 5 second respectively the relation between h1,h2,h3 is?
Q.2- The acceleration of a particle is increasing linearly with time t as bt .The particles starts from origin with an initial velocity vo .The distance travelled by the particle in time t will be?
Q.3- A body is dropped from a height H.The time taken to cover second half of the journey is ?
Q.4- Two balls are projected upward simultaneously with speeds 40 m/s and 60m/s .Relative position of second ball w.r.t first ball at time t=5 second is? (neglect air resistance)
Q.5- Two cars are moving in the same direction with a speed of 30 km/h .They are seperated from each other by 5 km. Third car moving in the opposite direction meets the two cars after an interval of 4 minutes. The speed of third car is ?
Q.6- A particle is thrown with any velocity vertically upward, the distance travelled by the particle in first second of its descent?
Q.7- A body is projected vertically upward with speed 10 m/s and other at same time with same speed in downward direction from the top of the tower .The magnitude of acceleration of first body w.r.t second is (g=10m/s2)?
Q.8- a ballon starts rising from the ground from rest with an upward acceleration 2m/s2.Just after 1 second, a stone is dropped from it .The time taken by stone to strike the ground is ?
Q.9- Two ends of a train moving with constant acceleration pass a certain point with velocities u and 3u. The velocity with which the middle point of the train passes the same point is ?
Q.10- A drunkard is walking along a straight road. He takes 5 steps forward and 3 steps backward ,followed by 5 steps forward and 3 steps backward and so on. Each step is one metre long and takes one second. There is a pit on the road 11 metres away from the starting point The drunkard will fall into the pit after?
Q.11- A body is released from the top of the tower of height H metre. After 2 seconds it is stopped and then simultaneously released What will be its height after next 2 seconds?
Q.12- A train is moving at a constant speed V. When its driver observes another train in front of him on the same track and moving in the same direction with constant speed u. If the distance between the trains be x,then what should be the minimum retardation of the train so as to avoid collison?
Q.13- A bullet fired into a fixed target loses half of its velocity after penetrating 3 cm. How much further it will penetrate before coming to rest assuming that it faces constant resistance to motion?
Q.14- The acceleration of the particle varies with time according to the relation :
the displacement of this particle at time t will be?
Q.15- A conveyer belt is moving horizontally at a speed of 4m/s. A box of mass 20 kg is gently laid on it .It takes 0.1 second for the box to come to rest on belt.If the beltcontinues to move uniformly then the distance moved by the box on the conveyer belt before seffling is?
Q.16- The distance travelled by the body falling freely from rest in the first ,second and third seconds are in the ratio ?
Q.17- A particle starts from the origin with a velocity of 10 m/s and moves with a constant acceleration till the velocity increases to 50m/s .At that instant ,the acceleration is suddenly reversed .What will be the velocity of particle when it returns to the starting point?
Q.18- An aircraft is flying at a height of 3400m above the ground. If the angle subtended at a ground observation point by the aircraft position 10 second apart is 30 degree then the speed of the aircraft is ?
Q.19- An aeroplane flies 400m north and 300m south and then flies 1200m upward then net displacement is approximately ?
Q.20- A rocket is fired from the earth surface such that it creates an accleration of 19.6m/s2 If after 5 second its engine is switched off ,the maximum height of the rocket from the earth's surface would be?
preeti reached the metro station and find out that escalator was not working . She walked up the stationary escalator in time t1. on the other hand if she remains stationay on moving escalator, then escalator took her up in time t2. The time taken by her to walk up on the moving escalator will be :
(A) t1t2/ t1+t2
(C) t1 +t2/2
(D) t1t2/t1 -t2