Question

Section C ( 3x5 = 15)
11. (a) State law of conservation of momentum. Express it mathematically, when two bodies of
masses m, and m, moving in same direction along same straight line with velocities U, and u, respectively,
collide and their respective velocities after collision become V, and V.
(b) A hammer of mass 500 g moving with 50 m/s strikes a nail. The nail stops the hammer in a small time
interval of 0.01/s. what is the change in momentum suffered by the hammer? Also calculate the force of the
hammer on the nail. What will be the force of the nail on the hammer? Give reason for your answer.
12. (i) Define momentum. State its Sl unit.
(ii) An object of mass 50 kg is accelerated uniformly from a velocity of 4 m/s to 8 m/s in 8 s. calculate the
initial and final momentum of the object. Also find the magnitude of the force exerted on the object.
13. A feather is dropped on the planet other than earth which has very low acceleration due to gravity from a
height of 1.40 meters. The acceleration of gravity on the other planet is 1.67 m/s . Determine the time of
feather to fall to the surface of the other planet​

Answer 1

Answer:

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Explanation:

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Answer 2

Answer:

and energy are closely tied to the concept of force because an applied force can do work on an object and cause a change in energy. Energy is defined as the ability to do work

Explanation: