Certain force acting on a 20 kg mass changes its velocity from `5 m s^-1` to `2m s^-1`. Calculate the work done by the force.

A constant force acting on a body of mass 3.0 kg changes its speed from 2.0 m s^-1 to 3.5 m s^-1 in 25 s. The direction of the motion of the body remains unchanged. What is the magnitude and direction of the force?

A bullet of mass 100 g strikes a wooden plank with a velocity of 300 ms^-1 and emerges with a velocity 100 ms^-1 .Calculate the work done by the resistive force on the bullet

An object of mass 100 kg is accelerated uniformly from a velocity of 5 m s^-1 to 8m s^-1 in 6 s. Calculate the initial and final momentum of the object. Also, find the magnitude of the force exerted on the object.

A partical moves 0.5kg travels in a straight line with a velocity v=ax^(3/2) ,where a=5m^(-1/2)s^-1 .What is the work doen by the net force during the displacment from X=0 to X=2m?

A body of mass 2 kg initially at rest moves under the action of 0 an applied horizontal force of 7 N on a table with coefficient of kinetic friction= 0.1. Compute the (a) work done by the applied force in 10 s, .

A force of 5N changes the velocity of a body from 10ms^-1 to 20ms^-1 in 5 sec. How much force is required to bring about the same change in 2 sec.

From a rifle mass 4kg a bullet of mass 50g is fired with an initia, velocity of 35 ms^-1 . Calculate the initial recoil velocity of the rifle.

A soap buble is slowing enlarged from a radius of 0.01 m to 0.1 m. Calculate the work done in the process[S= 26xx10^-3 N/m].

A force of 200 N is applied to a body and its velocity changes from 5m/s to 10m/s in a second. What is the mass of the body?

A hockey ball of mass 200 g travelling at 10 m s^-1 is struck by a hockey stick so as to return it along its original path with a velocity at 5m s^1 . Calculate the change of momentum occured in the motion of hockey ball by the force applied by the hockey stick.