Question

Find the kinetic energy of an object of mass 5kg and momentum 7Ns

Answer 1

Momentum = Mass * Velocity
7 = 5 * Velocity
Velocity = 7/5

Kinetic energy = mv^2 / 2
Kinetic energy = 5*(7/5)^2 /2
K.E. = 49/10
K.E. = 4.9 J