Question

A ball dropped off of a cliff from rest takes 4.00 s to reach the bottom of the cliff.

b. What is the velocity of the ball at the bottom of the cliff?


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Answer 1

Answer:

Speeding up While Falling Down

Gravity causes an object to fall toward the ground at a faster and faster velocity the longer the object falls. In fact, its velocity increases by 9.8 m/s2, so by 1 second after an object starts falling, its velocity is 9.8 m/s.

Answer 2

Required AnswèR :

៚ 39.2 m/s

Explanation of the Answer :

★Given :

• Free-fall from rest for 4 seconds

★Unknown :

• Final velocity (v)

★Solution :

Equation: v = at

The acceleration due to gravity is 9.8 m/s², so the velocity after 4 seconds will be,

 

v = (9.8 m/s²)(4 s) = 39.2 m/s

At the bottom of the cliff, the velocity of the ball will be 39.2 m/s.

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