A projectile is fired at an angle of 45º with the horizontal. Elevation angle of the projectile at its highest point, as seen from the point of projection, is :
The speed of a projectile at its maximum height is half of its initial speed. The angle of projection is -
A particle moves in the x – y plane according to the rule x = a sin ωt and y = a cos ωt. The particle follows:
1. a circular path.
2. a parabolic path.
3. a straight line path inclined equally to x and y-axes.
4. an elliptical path.
A car turns at a constant speed on a circular track of radius 100 m, taking 62.8 s for every circular lap. The average velocity and average speed for each circular lap, respectively, is :
2. 0, 10 m/s
3. 10 m/s, 10 m/s
4. 10 m/s, 0
For a projectile projected at angles (45°-θ) and (45°+θ), the horizontal ranges described by the projectile are in the ratio of:
A particle starting from the origin (0, 0) moves in a straight line in the (x, y) plane. Its coordinates at a later time are (, 3). The path of the particle makes an angle of .......................with the x-axis :
A particle of mass m is projected with velocity v making an angle of 45° with the horizontal. When the particle lands on the level ground, the magnitude of change in its momentum will be:
A particle has initial velocity and has acceleration . Its speed after 10 s is
1. 7 units
3. 8.5 units
4. 10 units
A missile is fired for a maximum range with an initial velocity of 20 m/s. If g= 10 m/s2, then the range of the missile will be
1. 50 m
2. 60 m
3. 20 m
4. 40 m
A body is moving with a velocity of 30 m/s towards the east. After 10 sec, its velocity becomes 40 m/s towards the north. The average acceleration of the body is: