Question

A sports car accelerates from rest to attain a speed of 60 km per hour in 15 seconds.
a) what is the change of speed?
b) what is the acceleration of the car?

Answer 1

Answer:

Acceleration is = 1.11m/s²

Explanation:

a) what is the change of speed?

The change of speed refers to the acceleration of the object (here sports car). Acceleration is mainly the change of speed (velocity) with specific period of time.

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b) what is the acceleration of the car?

Given -

Initial velocity (u) =0km/hr = 0m/s

Final velocity (v) =60km/hr = 60×5/18= 16.66m/s

Time = 15 secs.

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• $\tt\red{acceleration=\frac{v-u}{time}}$

$= \frac{16.66 - 0}{15} \\ \\ = \frac{16.66}{15} \\ \\ = 1.11$

Acceleration here is 1.11m/s².

Answer 2

Answer:

Explanation:

what is the change of speed?

The change of speed refers to the acceleration of the object (here sports car). Acceleration is mainly the change of speed (velocity) with specific period of time.

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b) what is the acceleration of the car?

Given -

Initial velocity (u) =0km/hr = 0m/s

Final velocity (v) =60km/hr = 60×5/18= 16.66m/s

Time = 15 secs.

1..11m/s

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