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2 years ago

A certain car can accelerate from rest to 70km/h in 7 seconds.Find the cars average acceleration

2 answers:

7 0

First: we have to express the units of velocity in m/s
70 km/h=70 km/h(1000 m/km)(1h/3600 s)=19.4444....m/s=19.44 m/s

average acceleration= (final velocity -initial velocity)/ time
average acceleration=(19.44 m/s - 0 m/s)/7 s≈2.78 m/s²

Answer: the cars average acceleration would be: 2.78 m/s²

Setler [38]2 years ago

4 0

A= (70-0)/7
a=10 km/hr/sec

10 km/hr = 10 km*100 m/km/(1 hr*3=600 sec/hr)=25/9 m/sec
---------------------------------------------------------------------------------
a= 25/9 m/sec/sec

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In this problem, neither side of the equation can be used to measure the change in momentum. In fact:

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Here the final velocity is not known, so it's not possible to use this side of the equation

- The impulse (right side) is given by

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here the average force is known, however the duration of the collision is not known, so it's not possible to use this side of the equation.

Learn more about momentum:

brainly.com/question/9484203

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