Question

A motorist accelerates from rest to a velocity of 90 km hr−1 in 15 seconds. What is the average acceleration of the car?​

Answer 1

Answer: 1.67 m/s²

Step-by-step explanation:

Given:

 Initial velocity = 0 km/h

 Final velocity  = 90 km/h

 Initial time       = 0 s

 Final time        = 15 s

Now,

we need to change the km/h to m/s =

                                             → 90 km/h ➡ m/s

                                             → 25 m/s

So,

Average Acceleration = Change in velocity ÷ Change in time

➡ (25 - 0) ÷ (15 - 0) =

➡ 25 ÷ 15 =

➡ 1.666....

➡ 1.67²

Hope it helps,

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