A bullet shot straight up returns to its starting point in 10 s. What is the initial speed of the bullet, assuming negligible air resistance?
A) 25 m/s
B) 49 m/s
C) 9.8 m/s
D) 98 m/s

Question

Quizplus · Accepted Answer

The bullet takes 10 seconds for the entire trip, so it takes 5 seconds to reach the maximum height. Using the formula $v = gt$, where $g = 9.8 \, \text{m/s}^2$ is the acceleration due to gravity and $t = 5 \, \text{s}$, we find the initial speed $v = 9.8 \times 5 = 49 \, \text{m/s}$.

A Bullet Shot Straight Up Returns to Its Starting Point