A body moves with a velocity of 10 `m/s` for 10 s and then with a velocity of 20 `m/s` in the same direction for 40 s. Find its average velocity.

Solve the following examples: (numerical problems) A body moves along a straight line at a velocity of 10 m/s for 10 s and then at a velocity of 15 m/s for 15 s. Find the average velocity of the body.

A particle moves for 20 s with velocity 3 m//s and then moves with velocity 4 m//s for another 20 s and finally moves with velocity 5 m//s for next 20 s. What is the average velocity of the particle ?

A body of mass 2 kg moves with a velocity of 5 m/s. Find its kinetic energy.

A bullet strikes a plank of thickness 5 cm with a velocity of 1000 m/s and emerges out with a velocity of 400 m/s, the average retardation of the bullet is

A body of mass 0.1 kg travelling with a velocity of 5 m/s, collides head-on with another body of mass 0.2 kg travelling in the same direction with a velocity of 1.2 m/s. If the two bodies stick together after collision, their common velocity is

A body moves from A to B at a speed of 10 m/s and back to A along the same path at a speed of 20 m/s. Find its average speed and average velocity for the journey. [Hint : If s is the distance covered by the body between A and B, average speed = (2s)/(t_1 + t_2) = (2s)/[(s/v_1)+(s/v_2)} = (2v_1v_2)/(v_1 + v_2)

A body moves with a uniform acceleration of 0.5 m//s^(2) . If its initial velocity is 20 m//s , find its velocity after 6 seconds.

Solve the following examples: (numerical problems) A body of mass 1 kg, moving with a velocity of 4 m/s collides with a body of mass 0.5 kg moving with a velocity of 2 m/s . If the velocity of the first body after collision is 8/3 m/s , find the velocity of the second body after collision.

A body has initial velocity of 3 m//s and has an acceleration of 2 m//s^2 . The distance travelled by it in 5 s and its velocity is

A body of mass 1 kg moves with an initial velocity of 15 m/s . If its velocity changes to 25 m/s in 5 seconds, find the force acting on the body.