physics
posted by Ellen .
A projectile is fired straight up at a speed of 15 m/s.
How long does it take to reach the top of its motion? The acceleration of gravity is 9.8 m/s2 .

well, it starts off at 15m/s
Every second, it loses 9.8m/s
How long does it take to lose the whole 15 m/s?
Yes, it really is as easy as it seems.
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