Question

A car started from rest and reached a velocity of 90 km/hr in 10 s. Which of the following is its acceleration?
1 2.5 km/hr2
2 2.5 m/s2
3 9 km/hr2
4 9 m/s2​

Answer 1

Answer:

2.5m/s²

Explanation:

As a=vf- vi÷t → eqn 1

vf=90km/hr  →  90×1000 ÷3600 → 25ms⁻¹

vi=0ms⁻¹

t=10s

Put all these values in eqn 1;

So

a= 25-0 ÷ 10

 =25 ÷ 10

 =2.5ms⁻²