it is a baseball or a tennisball.
the foam of the ball
Gravity
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No, it would bounce better on warm days because heat makes things exspand and cold makes thing shrink
metal
A softball!
18 feet.
cement
Probably bad shocks.
it depends if the softball is heavier than the baketball then no it will bounce lower. If a basketball is heavier than a softball it will bounce higher because of gravity
a one hopper