Question

How to calculate the kinetic energy of 400kg roller coaster car moving
at as speed of 20m/s?
A.80,000 J B.40, 000J C:20,000J D.10,000​

Answer 1

Answer:

A.80000J

Explanation:

Mass= 400 kg

Velocity= 20 m/s²

Kinetic energy= 1/2mv²= 1/2*400*20*20= 80000 J

Answer 2

Answer:

option c 10000 j

Explanation:

given

mass -1000kg

speed -20m/s

we had to substituting the formula

we get EK=1/2mv2×1000×20=10000

so, the answe is option d