carpets store more energy to the ball because it is under a hard floor. The floor is still their. on grass even thought is in the ground their is another layer which is the dirt. n the grass stores less energy.
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Wood, not being as hard as concrete, will deform a little when the ball hits it. This will take energy from the system and the ball will have less energy to bounce back up.
this i9s because concrete is a flat surface and grass can be pretty rough sometimes
...than on carpet? Concrete is rigid so it doesn't absorb the energy from the ball.