A ball is dropped onto a floor.
Its speed just before hitting the floor is 3.0 m/s.
Which change would result in a speed of 6.0 m/s just before hitting the floor?
Ignore any effects due to air resistance.
A Drop the ball from double the height above the floor.
B Drop the ball from four times the height above the floor.
C Use a ball with double the mass.
D Use a ball with four times the mass.

Therefore, Answer=B
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