Question

a stone is dropped from the edge of a roof. find the speed of the stone at 2s after the stone was dropped. how fast does it move

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Answer 1

Explanation:

Given ,

• initial velocity = 0 m/s
• Acceleration due to gravity = 10 m/s²
• Time taken = 2s

From acceleration ,

• v = u + at

Where,

• v = Final velocity
• u = Initial velocity
• a = Acceleration
• t = time

• v = u + at
• v = 0 + 10 × 2
• v = 0 + 20
• v = 20 m/sec

:. After 2 seconds the speed of the stone will be 20 m/sec .

Answer 2

Explanation:

Given ,

initial velocity = 0 m/s

Acceleration due to gravity = 10 m/s²

Time taken = 2s

v = u + at

v = 0 + 10 × 2

v = 20

v = 20 m/sec

:. After 2 seconds the speed of the stone will be 20 m/sec .