Question

A girl who weighs 30 kg is inline skating at a speed of 5 m/s. What is the girl's kinetic energy?

Answer 1

K.E =1\2 mv sq.

=1/2×30×25

=15×25=375

Answer 2

Weight of the girl = 30 kg

Speed (here taken as velocity) = 5 m/s

Kinetic energy of a body = 1/2 mv^2

= 1/2 x 30 x 5 x 5 = 15 x 25 = 375 joule

Answer 375 joule

Hope it helps.