Answer:
Time taken by the car = 6 seconds.
Explanation:
Given:
Case 1:
Initial velocity of the car, = 0
Final velocity of the car, = 30 m/s
Time taken by the car, = 12 sec
Case 2:
Initial velocity of the car, = 0
Final velocity of the car, = 15 m/s
Solution:
Lets find the acceleration in first case:
⇒ acceleration (a) = (final velocity - initial velocity) / time
⇒ Using this acceleration value we can find the time taken in case 2
⇒ time taken (t2) = (final velocity - initial velocity) / acceleration
So time taken by the car to go from rest to 15 m/s is 6 seconds.