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3 years ago

8

A bus is moving at 20 m/s. The bus starts to break, and finally reaches a speed of 0 m/s. The bus took 5 seconds to stop. What i

s the acceleration of the bus?

1 answer:

olya-2409 [2.1K]3 years ago

7 0

A = V - Vo / T

A = 0 - 20 / 5

A = -4 m/s^2

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A person on a merry-go-round is constantly changing direction.<br> True or false

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A kangaroo can jump over an object 2.46 m high. (a) Calculate its vertical speed (in m/s) when it leaves the ground.

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Answer:

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b) 1.42 seconds

Explanation:

t = Time taken

u = Initial velocity

v = Final velocity

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$v^2-u^2=2as\\\Rightarrow -u^2=2as-v^2\\\Rightarrow -u^2=2\times -9.81\times 2.46-0^2\\\Rightarrow u=\sqrt{2\times 9.81\times 2.46}\\\Rightarrow u=6.95\ m/s$

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Time taken to reach the maximum height is 0.71 seconds

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θ = 1 arc s (1º / 3600 s arc) (pi rad / 180º) =

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That angle is extremely small, so we can approximate the tangent to the angle

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Arturiano [62]

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