Question

A 1200-kg car moving at 20 km/h is accelerated

ata constant rate of 4 m/s2 up to a speed of 75km/h.
What are the force and total time required?

Answer 1

Force on the car will be 4800 N and time required to cover this distance 13.75 sec

Step-by-step explanation:

We have given mass of the car = 1200 kg

Initial velocity u = 20 km/h

Final velocity v = 75 km/h

Acceleration
`a=4m/sec^2`

From the first equation of motion we know that

v = u+at, here v is final velocity, u is initial velocity, a is acceleration and t is time

So
`75=20+4* t`

t = 13.75 sec

From second law of motion we know that
`F=ma`

So force
`F=1200* 4=4800N`