Question

A car moving with constant acceleration covers the distance between two points 180 m apart in 6 sec. Its speed as it passes the second point is 45 m/s. What is its acceleration and its speed at the first point​

Answer 1

Answer:

A car travelling at a constant acceleration covers the distance between two points 180m a part in 6sec. If the car is starting from rest and its speed at the second point is 45m/s, what is the acceleration of the car?

The car starts from rest part of the question is an extra information which adds to the bit of confusion. It doesnot say it was at rest when it started at the first point of 180 m distance.

So, we have

180=6u+12aX62

45=u+6a

Multiplying second eq by 6 and subtracting first eq from it we have

90=18a

Or a=5m/s2 and u=15m/s

As an aside acceleration < 1m/s2 is ideal for riding comfort. 5m/s2 is more than half of 1g!

Explanation:

Hope its is helpfull..