a bullet of mass 20g is to pass 2 points 30m apart in 4s .Find its kinetic energy

v = 30/4 = 7.5ms
m = 20g = 0.02kg 
t = 4s 
so,
KE = 0.5 (m x v2)
​       =  28.125 joules
so the kinetic energy is 28.125 joules