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
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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
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