Question

A girl of mass 43 kg is running
2.5m/s inside her class room, which is on the 3rd floor of her school. If each floor is 21m above
the one below it, find her a) kinetic energy b) potential energy​

Answer 1

Answer:

Given,

Mass = 43kg

Velocity = 2.5m/s

Height = 21m, 21×3 = 63m

To find:-

Kinetic energy and Potential energy

We know that K.E = 1/2mv^2

= 1/2×43×2.5×2.5

= 134.375J

We know that P.E = mgh

= 43×9.8×63

= 26548.2J.