Question

1. A car is travelling at 20 m/s. It accelerates uniformly at 3 m/s2 for 5 S.
a. Calculate the distance the car travels while it is accelerating.
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Answer 1

Given:-

→Initial velocity of the car=20m/s

→Acceleration of the car=3m/s²

→Time=5s

To find:-

→Distance travelled by the car while it is accelerating.

Solution:-

By using the 2nd equation of motion,we get:-

=>s=ut+1/2at²

=>s=20×5+1/2×3×(5)²

=>s=100+1.5×25

=>s=100+37.5

=>s=137.5m

Thus,the car travels a distance of 137.5m

while it was accelerating.

Some Extra Information:-

The 3 equations of motion are:-

•v=u+at

•s=ut+1/2at²

•v²-u²=2as

Note: The above 3 equations are only valid when a body is moving with uniform acceleration.