A reminder that you call the initial direction of motion positive, whether it is up or down. Then gravitational acceleration (which is always down) could be either + or -, depending on your system.
1.
If you drop a ball from a 50-m tower, how long
does it take to hit the ground and how fast is it traveling right before it
hits the ground? (3.2 seconds, 31.3 m/s)
2.
Throw a ball straight up at 25 m/s.
a.
How long will it take to reach the top of the
arc? (2.6 s)
b.
How long will it take to return to your
hand? (5.1 s)
c.
How high does it go? (31.9 m)
d.
Where exactly is the ball at the 4-second point
and how fast is it traveling? (21.6 m
above ground, -14.2 m/s)
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