Question

12.A car traveling at 20 km/h speeds up to 60 km/h in 6 seconds. What is its acceleration?
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Answer 1

Answer:

1.85 m/s^2

Explanation:

Here, Initial speed, u = 20 km/h

=20×1000 m60×60 s

=5.55m/s  …(1)

Final speed, v= 60 km/h

=60×1000 m60×60 s

 = 16.66 m/s  …(2)

Acceleration, a = ? (To be calculated)

And,   Time, t = 6 s

We know that :  v=u+at

So,   16.66=5.55+a×6

6a=16.66−5.55

6a=11.11

a=11.116

Thus, Acceleration, a = 1.85 m/s2