Question

A force of 50 N is required to push a car on a level road with a constant speed of 10 m/s. The speed of the car is 500 kg . What is a force should be applied to make the car accelerate at 1 $m/s^2$?

• A. 550 N
• B. 450 N
• C. 350 N
  
• D. 650 N
  

Answer 1

The correct option is A 550 N

Given,

Mass of car, $M=500kg$

Acceleration required, $a=1m{s}^{-2}$

A constant force $50N$ to get constant speed.

Therefore, friction force, $f=50N$

Required force = inertial force + friction force

$F=ma+f$

$F=500\times 1+50=550N$

Hence, required force is $550N$