Question

4) 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 taken is 10 sec and the mass

of the car is 1000kg.​

Answer 1

Answer:

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

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

Acceleration= \frac{change in velocity}{time taken}

timetaken

changeinvelocity

............(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}

10

30

= 3

Putting value of acceleration in eqn (1)

Answer 2

Answer:

acceleration = change in velocity / time

= 30 - 0 / 10 = 3

F = ma

= 1000 × 3

= 3000 N