Lars is standing near the edge of a 90-meter cliff. He throws a ball upward, but does not catch it, and it falls to the bottom of the cliff face. From when he threw the ball upward to when it hit the ground below, 5.55 seconds passed. What was the initial vertical velocity of Lars' throw? a. -43 m/s
b. -11 m/s
c. 43 m/s
d. 11 m/s

c. 43 m/s

Explanation:

Given the following data;

Displacement, S = 90 meters

Time, t = 5.55 seconds

To find the initial velocity;

We would use the second equation of motion given by the formula;

Where;

We know that acceleration due to gravity is -9.8m/s² because the direction is downward.

Substituting into the equation, we have;

Rearranging the equation, we have;

Initial velocity, u = 43.41 ≈ 41 m/s

magnityde and direction

he made 11 calls in one day