Question

A long jumper left the ground with an initial vertical velocity of 3.89 m/s and an initial horizontal velocity of 9.97 m/s. At the highest point in the trajectory before landing, the jumper’s vertical velocity will be _____. (neglect the influence of air resistance) Group of answer

choices

-9.81 m/s2

3.89 m/s 0 m/s

9.97 m/s

Not enough information is provided to answer the question

Answer 1

Ans :0m/s

At the highest point of trajectory, the jumpers vertical velocity will be zero. The upward motion of the jumper is influenced by the gravitational force of Earth. This force is pulling jumper back to Earth . So the upward motion is a decelerating motion. The vertical velocity is constantly decreasing at a rate of acceleration due to gravity, 'g' (9.8m/s^2). Eventually the vertical velocity will reach zero. The vertical velocity will further decreases and become negative. This causes the direction of motion to reverse. Thus at highest point vertical velocity is zero. On the other hand horizontal velocity is constant throughout the trajectory.