A projectile is launched straight upward at 50 m/s.Neglecting air resistance its speed upon returning to its starting point is
A)less than 50 m/s.
B)50 m/s.
C)more than 50 m/s.

Question

Quizplus · Accepted Answer

The speed of the projectile when it returns to its starting point will be the same as its initial speed as long as air resistance is neglected. This is because the only force acting on the projectile is gravity, which accelerates it downward at a constant rate of 9.81 m/s^2. As the projectile reaches its maximum height, it momentarily comes to a stop before accelerating downward due to gravity. However, at all times during its motion, the speed is the same as the initial speed of 50 m/s. Therefore, the answer is B) 50 m/s.

A Projectile Is Launched Straight Upward at 50 M/s