1. A particle of mass 0.3 kg is subjected to a force F = -kx with k = 15 N/m. What will be its initial acceleration if it is released from a point 20 cm away from the origin?

2. A block of mass M is placed on a flat surface. A force is applied to move it parallel to the surface. The frictional force f developed is proportional to the

3.  A ball is travelling with uniform translator motion. This means that

4. Two bodies of masses 4 kg and 5 kg are acted upon by the same force. If the acceleration of lighter body is 2 m/s², the acceleration of heavier body is

5. Ratio of force and acceleration measures :

6. A fireman wants to slide down a rope. The breaking load for the rope is 34 th of the weight of the man. With what minimum acceleration should the fireman slide down? Acceleration due to gravity is g.

7. A block of wood is placed on a surface. A force is applied parallel to the surface to move the body. The frictional force developed acts

8. A body is placed on an inclined plane and has to be pushed down. The angle made by the normal reaction with the vertical will be

9. A bullet of mass 25 g moving with a velocity of 200 cm/s is stopped within 5 cm of the target. The average resistance offered by the target is

10. The frame of reference attached to a satellite of the earth is

11. A man in a train in motion is facing the engine. He tosses a coin up, the coin falls behind him. The train is

12. A jet of water of cross-sectional area ‘a’ strikes a wall at angle θ with the wall and rebounds elastically with the same speed v. If density of water be p, then the normal thrust on the wall will be

13. Conservation of momentum in a collision between particles can be understood from

14. A hockey player is moving northward and suddenly turns westward with the same speed to avoid an opponent. The force that acts on the player is

15. A block of mass 2 kg rests on a rough inclined plane making an angle of 30 degree with the horizontal. The coefficient of static friction between he block and the plane is 0.7. The frictional force on the block is

16. A body of mass 2 kg travels according to the law x(t) = p(t) + qt2 + rt3 where p = 3 m/s, q = 4 m/s2, and r = 5 m/s3. The force acting on the body at t=2 seconds is

17. The mass of a body is 2 kg. It weight is

18. A jet plane flying in atmosphere gets reaction from

19. A metre scale is moving with uniform velocity. This implied

20. Out of the basic forces , gravitational force