Question

student wants to determine the effect of mass on kinetic energy. She will drop two balls of the same size into a pool of water. Which investigation method should the student use?(1 point)
Responses

She should drop two balls of the same mass from different heights.
She should drop two balls of the same mass from different heights.

She should drop two balls of the same mass from the same height.
She should drop two balls of the same mass from the same height.

She should drop two balls with different masses from different heights.
She should drop two balls with different masses from different heights.

She should drop two balls with different masses from the same height.
She should drop two balls with different masses from the same height.

Answer 1

She should drop two balls with different masses from the same height.

Reason: keeping height the same keeps the speed on impact the same (neglecting air resistance), so any difference in kinetic energy comes from the different masses (KE = 1/2 mv^2).