Question 13: In which of the following cases, force can only change motion or only deform:

A – Both change motion and deform (the ball will be distorted and redirected to fly in the opposite direction)

B – Change the motion and deform (the ball will be distorted and fly away, the movement will be faster than the original)

C – only deforms (pressing or pulling the spring is just a deformation spring, not a moving spring)

D – Both change motion and deformation (Pressing hard on the two rubber balls will initially cause the two balls to distort, then when we let go, the two balls will pop out and move in opposite directions)

The answer to choose is: