A 4kg mass moves with a velocity of 5m\s find the kinetic energy

Answer 1

k•E =1\2mv2
k•E=
=1\2×4×5×5
k•E=1×4×25÷2=50

Answer 2

looks good

Joules, right?

Answer 3

given:m=4,v=5,k.e=?we have k.e=0.1mv2 which is 0.5×4×25=50j