Question

a body moving with velociy 10m/s and its kinetic energy is 30m/s.if is speed increase by 30m/s then its kinetic energywill be..

Answer 1

K.E.=1/2mv^2

30J=1/2×m×(10)^2

m=6/10

So KE after speed becomes 30m/s

KE=1/2×6/10×(30)^2

K.E.=270Joules