Question

Q.15. A car is moving with a speed of 3.2 m/s when brakes are applied. If the car stops after it has moved 1.8 m, what was its average acceleration?​

Answer 1

Answer:

5m

Explanation:

5m

Explanation:

During the last second acceleration is −5m/s  

2

 and car's final velocity is zero.

Thus, from the equation,

u=v−at

u=0−(−5)×1

u=5m/s

The initial speed of the car at the start of last second is 5m/s and after one second it stops.

• Therefore, the distance covered in last second will be 5m.