Question

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 .

Answer 1

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.