Question

A car speeds up from 12 m/s to 20 m/s
in 6.4s. If its mass is 1200 kg, what force
must its engine provide?​

Answer 1

$\huge\underline\mathfrak\red{✨Answer✨}$

• We might know that the greater the acceleration of, say, a car moving away from a stop sign, the greater the displacement in a given time. But we have not developed a specific equation that relates acceleration and displacement. In this section, we develop some convenient equations for kinematic relationships, starting from the definitions of displacement, velocity, and acceleration already covered.

Answer 2

Acceleration =( final velocity - initial velocity) /time

a=( 20-12)/6.4 =1.25 m/s^2

Assuming that the air resistance is negligible, we can use this formula Force =mass x acceleration

Plugging values in will give us 1200 x 1.25 = 1500 N

So the force the engine has to provide is 1500 N.