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6
10 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 6.0m/s just before hitting the floor?
Ignore any effects due to air resistance.
X Х
A
Drop the ball from double the height above the floor.
B
Drop the ball from four times the height above the floor.
с
Use a ball with double the mass.
D
Use a ball with four times the mass.

Aballoon is rising vertically upwards at a velocity of 10m/s. when it is at a height of 45m from the ground, a parachute bails out from it. after 3s he opens his parachute and decelerates ata a constant rate 5m/s. when. (a) what was the height of the parachutist above the ground when he opened his parachute? (b)how far is the parachutist from the balloon at t=3s? (c)with what velocity does the parachutist hit the ground? (d)after how long does the parachutist hit the ground after his exist from the balloon?