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# AS Physics - Acceleration watch

1. Q1) The best throwers in the world are baseball pitchers. They can release a ball travelling at a speed of 40 m/s. In doing so, they accelerate the baseball through a distance of 3.6m. Calculate:

a) the average speed of the ball during the throw.
b) the time during which the ball is being accelerated.
c) the average acceleration of the baseball.

a) 20 m/s.
b) 0.18s
c) 220 m/s^2
2. (assuming constant acceleration)

a) average speed = (initial speed + final speed)/2 = 40/2 = 20 m/s

b) time = distance/average speed = 3.6/20 = 0.18 s

c) (from s=ut+at²/2) acceleration = 2* distance/time² = 2*3.6/0.18² = 220 m/s² (2sf)
3. Cheers

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Updated: November 13, 2004
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