# Physics

Can someone help me with these questions? I don't want the answers just some direction in how to solve them.

A motorcycle at a stoplight takes 4.22 seconds to accelerate to 28.0 m/s after the light turns green. What is its average acceleration?

An object that starts at rest accelerates until it is moving at 247 km/h. If it takes 1.7 minutes for this change to occur what is the average acceleration in m/s?

It takes a truck 3.56 seconds to slow down from 112 km/h to 87.4 km/h. What is its average acceleration?

How much time does it take for a car to accelerate from 3.44 m/s to 20.9 m/s if the average acceleration is 6.00 m/s^2?

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1. <<A motorcycle at a stoplight takes 4.22 seconds to accelerate to 28.0 m/s after the light turns green. What is its average acceleration?>>
a=changevelocity/time=28/4.22 m/s^2
<<An object that starts at rest accelerates until it is moving at 247 km/h. If it takes 1.7 minutes for this change to occur what is the average acceleration in m/s?>> same formula: change km/hr to m/s, minutes to seconds.
<<How much time does it take for a car to accelerate from 3.44 m/s to 20.9 m/s if the average acceleration is 6.00 m/s^2? >> Here,
a= changevelocity/time=(vfinal-vinitial)/time. Solve for time.

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bobpursley

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