Question

Terry dropped a pebble from the top of his apartment building. The pebble impacted the ground after falling for 2.2 seconds. Calculate the final velocity of the pebble at impact with the street below. -4.45 m/s -21.5 m/s -23.7 m/s -9.8 m/s​

Answer 1

The final velocity of the pebble as it hits the ground is 21.5 m/s.

We have to use the equation;

v = u + gt

Where;

v = final velocity

u = initial velocity

g = acceleration due to gravity

t = time

Since the pebble was dropped from a height, u =0 m/s, hence,

v = gt

v = 9.8 ms-2 × 2.2 s

v = 21.5 m/s

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