4) A motorcycle travels at a constant 90 km per hour in the positive direction down a straight line highway.

What is the displacement, in standard units, of the car 75 seconds later?

1875 meters

Explanation:

We are given;

Velocity of the motorcycle as 90 km/hr Time as 75 seconds

We are required to calculate the displacement;

First we will convert speed to m/s The suitable conversion factor will be;

1 m/s = 3.6 km/hr

Therefore, 90 km/hr

= 90 km/hr : 3.6 km/hr per m/s

= 25 m/s

But;

Displacement = Velocity * time

Thus;

Displacement = 25 m/s * 75 seconds

= 1875 meters