If a projectile is fired straight up at a speed of 10 m/s, the total time to return to its starting position is about
A)1 s.
B)2 s.
C)10 s.
D)20 s.
E)not enough information given

Question

Quizplus · Accepted Answer

The time to reach the highest point is given by t = v/g, where v is the initial velocity (10 m/s) and g is the acceleration due to gravity (approximately 9.8 m/s²). So, t = 10/9.8 ≈ 1.02 s. The total time for the round trip is twice this, approximately 2 s.

If a Projectile Is Fired Straight Up at a Speed