Question

What is the amount of force required to increase the velocity of a car by 30m/s starting from rest .it is given that the time is 10sec and the mass of the car is 1000kg.

Answer 1

force will be 3000 N
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Answer 2

Force= mass × acceleration ...................................................(1)

We know mass is 1000kg, now to find acceleration.

Acceleration= $\frac{change in velocity}{time taken}$ ............(2)

(change in velocity =30-0{since initially it is at rest}, So total change in velocity=30m/s)

Time taken =10sec

Putting value of change in velocity and time in eqn (2)

We get, Acceleration= $\frac{30}{10}$ = 3

Putting value of acceleration in eqn (1)

We get Force= 1000 × 3 = 3000 N