Question

A car moving 20 m/s accelerates at 3 m/s for 5 seconds. what is the final velocity?

Answer 1

The final velocity is of the car is 35$ms^{-1}$.

Explanation:

The car initially moves in the velocity 20 $ms^{-1}$. It then accelerated by 3$ms^{-2}$ for 5 seconds.

The formula to find final velocity, $v_f=v_i+a(t).$

$v_i$:  initial velocity of the car.

a:  acceleration rate.

t:  time.

$v_f$:  final velocity  

From the given information,

$v_i$= 20$ms^{-1}$.

a=3$ms^{-2}$.

t= 5s.

$v_f$=20+3(5).

=20+15.

=35$ms^{-1}$.

∴The final velocity of the moving car is 35$ms^{-1}$.