A car with an initial speed of 50 km/h accelerates at 5000 km/h2 along a straight road. a. How long will it take to reach a speed of 120 km/h?

It will take 0.014 hour or 50.4 seconds to reach a speed of 120 km/h

Explanation:

We are given:

Initial speed of car = Vi = 50 km/h

Final Speed of car = Vf = 120 km/h

Acceleration of car = a = 5000 km/h²

Time taken = t = ?

Using 1st equation of motion;

Vf = Vi + at

t = (Vf - Vi) / a

t = (120 km/h - 50 km/h) / 5000 km/h²

t = 0.014 h

t = (0.014 h) (3600 sec/1h)

t = 50.4 sec