A 30gm butter initially travelling at the rate of 500 m/s penetrates 12 cm into a wooden block . What average force does it exert?

A 20 gram bullet moving at 300 m/s stops after penetrating 3 cm of bone. Calculate the average force it exerts.

A machine gun of mass 15 kg fires 30g bullets at the rate of 5 bullets per second with a velocity of 500 m/s. What force in newton's must be applied to the gun to hold in position ?

Bulltes of 0.03 kg mass each hit a plate at the rate of 200 bullets per second, with a velocity of 50 m/s and reflect back with a velocity of 30 m/s. The average force acting on one plate (in Newton) is

A machine gun has a mass 5 kg. It fires 50 gm bullets at the rate of 30 bullets per minute at a speed of 400 m/s. What force is required to keep the gun in position.

A steel ball of mass m is initially at rest on a horizontal frictionless surface. It is struck head on by another steel ball of mass 2m travelling with a velocity of 50 cm/s. Calculate the velocities of the two balls after a collision assuming it to be elastic.

A body of 0.02 kg falls from a height of 5 mts into a pile of sands. The body penetrates the same at the distance of 5cm before stopping. What force the sand exerted on the body ?

A body of mass 1 kg initially at rest explodes and breaks into three fragment of masses in ratio 1 : 1 : 3. The Pieces of equal masses fly of perpendicular to each other with a speed of 30 m/s each. What is the velocity of the heavier segment.

A ballon has 8 gm of air. A small hole is pierced into it. The air escapes at a uniform rate of 7cm/s . If the ballon shrinks in 5.6 second, the average force acting on the ballon is

A particle travelling along a straight line traversed one third of the total distance with velocity 4m//s . The remaining part of the distance was covered with a velocity 2m//s for half of the time and with velocity 6m//s for the other half of the time. What is the average velocity for the whole motion.

A car accelerates from rest at constant rate of 2m/s^2 for some time. Then it retards at constant rate of 4m/s^2 and comes to rest . If the total time for which it remains in motion is 3 seconds, what is the distance travelled ?