Question

A body of mass 25g has a momentum of 0.40kg m/s. find the kinetic energy.

Answer 1

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 = 1/2mv​2
Ek​ = [1/2 * 0.025 * 16 * 16] J
E​k = 3.2 J

Answer 2

first we take out the velocity by M is equal to MV that you put the velocity formula in the kinetic energy formula and forget 3.2 June