A ball is thrown straight upward from ground level with a speed of $18 \mathrm {~m} / \mathrm { s }$ How much time passes before the ball strikes the ground if we disregard air resistance?
A) 3.7 s
B) 1.8 s
C) 1.1 s
D) 0.6 s

Question

Quizplus · Accepted Answer

The time to reach the maximum height is $ t = \frac{v}{g} = \frac{18 \, \text{m/s}}{9.8 \, \text{m/s}^2} \approx 1.84 \, \text{s} $. The total time for the round trip is twice this, approximately $ 3.7 \, \text{s} $.

A Ball Is Thrown Straight Upward from Ground Level with a Speed