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Marysya12 [62]
2 years ago
13

A ball rolls off an 8.0 m high building and strikes the ground 5.0 m away from the base of the building. How fast was the ball r

olling?
Physics
1 answer:
HACTEHA [7]2 years ago
4 0

Answer: horizontal speed is 3.9 m/s

Explanation: when ball starts to drop, its vertical speed v0 is zero.

We can calculate dropping time from s = v0t +0.5gt².

Dropping time t= √(2s/g)= √((2·8.0 m)/9.81 m/s²)= 1.277 s

Because ball travels horizontal distance s= 5.0 m

HorizontalSpeed v = s/t = 5.0 m/1.277s= 3,915 m/s

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An object starts at rest. Its acceleration over 30 seconds is shown in the graph below:
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(C) is correct option.

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Area under the acceleration -time graph gives speed.

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speed = area\ of\ tringle

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T= 11.0003s

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The outer ring with a radius of 30 m

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