A girl at the top of a building of height 1.10 x 102 m throws a water balloon downward onto the head of an
unsuspecting rodent. It takes 4.00 s for the balloon to travel from the girl’s hand to the rodent’s skull.
28) At what velocity does the water balloon hit the rodent?
Answer: 47.1 m/s [D]
29) At what speed does the water balloon leave the girl’s hand?
Answer: 7.90 m/s
An idiot shoots a gun straight up into the air on New Year’s Eve. The “muzzle velocity” of the gun (the speed
at which the bullet leaves) is 3.00 x 102 m/s.
30) What is the velocity of the bullet 45.0 s after it leaves the gun?
Answer: 1.41 x 102 m/s [D]
31) What is the maximum altitude of the bullet?
Answer: 4.59 km
A car is moving at 20.0 m/s [N] when it begins to constantly accelerate to a final velocity of 10.0 m/s [N]. It
travels 1.50 x 102 m during this time.
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View Full Document32) How long did the acceleration last?
Answer: 10.0 s
33) What was the average acceleration of the car during this time?
Answer: 1.00 m/s2 [S]
The next generation of deepspace probes may be powered by an “iondrive” engine, which will provide a
small but continuous acceleration for years at a time. (Rockets now provide large accelerations but only for a
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 Spring '10
 Phys123
 Acceleration, Velocity, m/s, New Year's Eve

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