Question

38. A car starting from rest and moving with uniform acceleration attains a speed of 90kmh-1 in 20s on a

Express highway. Calculate its uniform acceleration.

1.25ms-2

1.55ms-2

1.35ms-2

1.12ms-2​

Answer 1

Answer:

No.... 4:1.23ms-2

Explanation:

Thank u

Answer 2

Answer :

Initial speed = zero (i.e., rest)

Final speed = 90km/h = 25m/s

Time of journey = 20s

We have to find acceleration of car during the given interval of time$.$

◈ What is acceleration ?

Acceleration is defined as the rate of change of speed. In other words it is a ratio of change in speed to the time interval.

It is a vector quantity having both magnitude as well as direction.

Formula : a = (v - u) / t

» a = (v - u) / t

» a = (25 - 0) / 20

» a = 1.25m/s²

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