Question

a car initially at rest picks up a velocity of 90km/h in 40 seconds.if the mass of the car is 1500kg.Find the force developed by its engine.​

Answer 1

Answer:

The required force is 937.5 N

Explanation:

Initial velocity, u = 0 m/s

Final velocity, v = 90 km/h

v = 90 × 5/18 m/s

v = 25 m/s

time taken, t = 40 s

mass of the car, m = 1500 kg

First, let's find the acceleration.

Acceleration is the rate of change of velocity.

a = (v – u)/t

a = (25 – 0)/40

a = 25/40

a = 5/8 m/s²

We know that,

F = ma

where

m denotes mass

a denotes acceleration

Substituting the values,

F = 1500 × 5/8

F = 937.5 N

Therefore, the force developed by its engine is 937.5 N