Question

A billet moving with a velocity of 400m/s has a K.e pc 1200J. Find the mass

Answer 1

1/2mv^2= 1200

1/2m *400*400=1200

m= 6/400 kg

Answer 2

ke =1/2 mv^2

1200 =1/2*400*400*m

m=1200*2/160000

m=3/200

m=0.03/2

m=0.015