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Two Motion Questions

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1. A truck initially traveling at 30 mph decelerates at 4 ft/s^2. Find
(a) how long it takes to stop,
(b) how far it moves in that time, and
(c) how far the truck moves in the third second after the brakes are applied.

2. A boy throws a ball straight up from the top edge of a 50-ft building with a speed of 20 ft/s. How long does it take for the ball to reach the ground, and how fast is it going just before it hits?

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Solution Summary

Solution mentions all the formulae used in solving the given problems. In second problem, solution considers two stages of ball movement: first upwards and then downwards.

Solution Preview

Please see the attached file.

The useful formulae:
Constant velocity:
Acceleration :

1. A truck initially traveling at 30 mph decelerates at 4 ft/s^2. Find (a) how long it takes to stop, (b) how far it moves in that time, and (c) how far the truck moves in the ...

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