Question

A car moves with constant acceleration of 8 m/s for 5 seconds. If the final velocity is 40, what is the initial velocity?

Answer 1

To find the initial velocity of the car, we can use the following formula of motion:

$v=u+at$

where:

• $v$ is the final velocity (40 m/s),
• $u$ is the initial velocity (what we want to find),
• $a$ is the acceleration (8 m/s²), and
• $t$ is the time interval (5 seconds).

Plugging in the known values into the formula, we get:

$40=u+(8\times 5)$

Simplifying the equation:

$40=u+40$

Subtracting 40 from both sides of the equation:

$u=40-40$

Therefore, the initial velocity of the car is $u=0$ m/s.