# physics

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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 .

• physics -

Vf = Vo + gt,
t = (Vf - Vo) / g,
t = (0 - 15) / -9.8 = 1.53s.

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