It takes a car 10 seconds to increase its speed from from 60 k/hr to 90 k/hr. What is the rate of acceleration (slope) in k/hr/sec?
A) 6
B) 9
C) 3
D) 1/6
E) 1/9

Question

Quizplus · Accepted Answer

Acceleration is defined as the rate of change of velocity over time. In this case, the velocity increased from 60 k/hr to 90 k/hr, which is a change of 30 k/hr. The time it took for this change to occur was 10 seconds.

Therefore, the rate of acceleration can be calculated as follows:

Rate of acceleration = Change in velocity / Time taken

Rate of acceleration = 30 k/hr / 10 sec = 3 k/hr/sec

Therefore, the rate of acceleration (slope) in k/hr/sec is 3, which is option C.

It Takes a Car 10 Seconds to Increase Its Speed