Question

A body of mass 25g has a momentum of 0.04 kg m/s. Find its kinetic energy.

Answer 1

Explanation:

mass = 25 g = 0.025 kg

momentum = 0.4 kgm/s

to find : Kinetic Energy

Solution : mass * velocity = momentum

0.025 kg * velocity = 0.4 kgm/s

velocity = [0.4/ 0.025] m/s

velocity = 16 m/s

Kinetic Energy = 1/2mv2

Ek = [1/2 * 0.025 * 16 * 16] J

Ek = 3.2 J

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Answer 2

Answer:

momentum =mv

4/100=25*v/1000

v=40/25m/s

kinetic energy =1/2mvsqu.

1/2*25*40/25*40/25

20*40/25joule

32 joule

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