Question

A rock dropped off a bridge takes 5 seconds to hit the water. Which of the following best represents the rock's speed just before impact?
50 m/s

5 m/s

125 m/s

2 m/s

Answer 1

Answer:

5

Step-by-step explanation:

Answer 2

Speed of rock before impact is 50 m/s

Given that;

Time taken by rock from bridge = 5 seconds

Find:

Speed of rock before impact

Computation:

Initial velocity = 0 m/s

Using first equation of motion

v = u + gt

v = 0 + (10)(5)

v = (10)(5)

v = 50 m/s

Final velocity = 50 m/s

Speed of rock before impact = 50 m/s

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