For a short period of time, the frictional driving force acting on the wheels of the 2.5-Mg van is N, where t is in seconds. If the van has a speed of 20 km/h when t = 0, determine its speed when t = 5 s.

15.6m/s

Completed Question;

For a short period of time, the frictional driving force acting on the wheels of the 2.5-Mg van is N= 600t^2 , where t is in seconds. If the van has a speed of 20 km/h when t = 0, determine its speed when t = 5

Explanation:

Mass m = 2500kg

Speed v1 = 20km/h = 20/3.6 m/s = 5.556 m/s

To determine speed v2;

Using the principle of momentum and impulse;

mv1 + ∫₀⁵ F dt = mv2

we need to know the time interval during which the force acts. impulse of force = momentum change