Question

Who would have the most kinetic energy?
A. A 80 kg student sitting in the bottom row of the bleachers.
B. A 80 kg student sitting up in the toprow of the bleachers.
C. A 65 kg player running down the court.
D. A 65 kg player walking down the courtPE = mghg = 9.8 m/s2 KE = ½ mv2

Answer 1

Answer:

C

Explanation:

In option A and B, there is no motion observed by the men. Hence, their velocities would be zero and thus, there Kinetic energy would be zero.

Now, in option D, the man is walking down the court. Hence, there would be some velocity of man. Thus, a Kinetic energy would also be there.

In option C, the man is running down the court and we know,

$velocity \: of \: walking\leqslant velocity \: of \: running$

Hence, Kinetic energy of Man in C is more than Man in Option D

Basic Maths: Kinetic energy ∝ square of Velocity

THANKS