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What is the car speed after 9 seconds

publish date: 2022/05/10 04:32:00 GMT+10

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You are doing a drive test for a new car.  You started the car from rest and accelerated at the rate of 6 km/hr/s.  What is the speed of the car after 9 seconds?

50 km/hr
54 km/hr
15 km/hr
60 km/hr

Correct Answer

54 km/hr

Explanation

First, you need to write down the acceleration equation

a = (v1 - v0) / t = 6 km/hr/s

v0 = 0 (since car is starting from rest)

v1 = ?

t = 9 seconds

substitute in the equation

v1 = a * t = 6 km/hr/s * 9 seconds = 54 km/hr

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