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) 2 seconds.
B) 10 seconds.
C) 20 seconds.
D) 1 second.
E) not enough information to estimate

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 second. The total time for the round trip is twice this, so approximately 2 seconds.

If a Projectile Is Fired Straight Up at a Speed