A ball of mass 0.2 kg moves with a velocity of 20 m/sec and it stops in 0.1 sec; then the force on the ball is 

(1) 40 N

(2) 20 N

(3) 4 N

(4) 2 N

Concept Questions :-

Application of laws
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The ratio of the weight of a man in a stationary lift and when it is moving downward with uniform acceleration ‘a’ is 3 : 2. The value of ‘a’ is (g-Acceleration due to gravity of the earth) 

(1) 32g

(2) g3

(3) 23g

(4) g

Concept Questions :-

Application of laws
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If force on a rocket having exhaust velocity of 300 m/sec is 210 N, then rate of combustion of the fuel is 

(1) 0.7 kg/s

(2) 1.4 kg/s

(3) 0.07 kg/s

(4) 10.7 kg/s

Concept Questions :-

Variable mass system
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In an elevator moving vertically up with an acceleration g, the force exerted on the floor by a passenger of mass M is 

(1) Mg

(2) 12Mg

(3) Zero

(4) 2 Mg

Concept Questions :-

Application of laws
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A 5000 kg rocket is set for vertical firing. The exhaust speed is 800 ms–1. To give an initial upward acceleration of 20 ms–2, the amount of gas ejected per second to supply the needed thrust will be (g = 10 ms–2) 

(1) 127.5 kg s–1

(2) 187.5 kg s–1

(3) 185.5 kg s–1

(4) 137.5 kg s–1

Concept Questions :-

Variable mass system
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If a person with a spring balance and a body hanging from it goes up and up  in an aeroplane, then the reading of the weight of the body as indicated by the spring balance will 

(1) Go on increasing

(2) Go on decreasing

(3) First increase and then decrease

(4) Remain the same

Concept Questions :-

Spring force
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A body is imparted motion from rest to move in a straight line. If it is then obstructed by an opposite force, then 

(1) The body may necessarily change direction

(2) The body is sure to slow down

(3) The body will necessarily continue to move in the same direction at the same speed

(4) None of these

Concept Questions :-

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A second's pendulum is mounted in a rocket. Its period of oscillation decreases when the rocket 

(1) Comes down with uniform acceleration

(2) Moves round the earth in a geostationary orbit

(3) Moves up with a uniform velocity

(4) Moves up with uniform acceleration

Concept Questions :-

Application of laws
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Two balls of masses m1 and m2 are separated from each other by a powder charge placed between them. The whole system is at rest on the ground. Suddenly the powder charge explodes and masses are pushed apart. The mass m1 travels a distance s1 and stops. If the coefficients of friction between the balls and ground are same, the mass m2 stops after travelling the distance 

(1) s2=m1m2s1

(2) s2=m2m1s1

(3) s2=m12m22s1

(4) s2=m22m12s1

Concept Questions :-

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A force vector applied on a mass is represented as F=6i^8j^+10k^ and accelerates with 1 m/s2. What will be the mass of the body 

(1) 102kg

(2) 210kg

(3) 10 kg

(4) 20 kg

Concept Questions :-

Application of laws
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