Question

a bus and a car have same kinetic energy which of two is moving fast explain

Answer 1

KE = m v^2 / 2 = same for the bus (m2, v2) and the car (m1, v1 ).
So. m1 v1^2 = m2 v2^2

v1/v2 = sqrt (m2/m1)

As the mass m2 of the bus is more, velocity/speed v1 of the. car is more.

Answer 2

kinetic energy is the energy which is obtained by the motion. And here both have same kinetic energy so their speed is equal