Question

A car acquires a velocity of 180 km/h in 20 sec starting from rest find, a ) acceleration, b) average velocity, c) the distance travelled in this time

Answer 1

Answer:

Explanation:I assume you mean the car is traveling at 72 kph.

Convert from kph to m/s.

72 km/hr*(1 hr/3600 sec)*(1000m/km)=20 m/sec

a=%28vf-vi%29%2Ft=%2820-0%29%2F10=2 m/sec^2

The average acceleration is 2 m/s^2.

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The average velocity is  

Vave=%28Vf%2BVi%29%2F2=%2820%2B0%29%2F2=10 m/s

The average velocity is 10 m/s.

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The distance traveled, at constant acceleration, is,

d=%281%2F2%29at%5E2=%281%2F2%29%282%29%2810%29%5E2=100+m

The car traveled 100 m