Question

kinetic energy of a body moving with speed 10 metre per second is 30 joule. if its speed becomes 30 metre per second, its kinetic energy will be?​

Answer 1

Answer:

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