Question

How much force is needed to accelerate an object of mass 90 kg at a rate of 1.2 m/s2

Answer 1

Answer : The force needed is 108 N.

Explanation :

Force : It is defined as the product of mass of an object and acceleration of an object.

Formula used :

$Force=Mass\times Acceleration$

Given:

Acceleration = $1.2m/s^2$

Mass = 90 kg

Now put all the given values in this formula, we get:

$Force=90kg\times 1.2m/s^2$

$Force=108kg.m/s^2=108N$

The unit of force is, N or $kg.m/s^2$

Therefore, the force needed is 108 N.

Answer 2

∑F = ma = (90 kg)(1.2 m/s²) = 108 N = 100 N (1 significant digit)