Question

a car is sitting at rest at a red light. when the light turns green the driver hits the gas, giving the car a constant acceleration equal to 0.7 m/s². after the car has been accelerating for 2.2 seconds, what is its velocity equal to?

Explanation:

Step1: Identify the formula

We use the formula $v = v_0+at$, where $v$ is final velocity, $v_0$ is initial velocity, $a$ is acceleration and $t$ is time.

Step2: Determine the initial - velocity value

The car starts from rest, so $v_0 = 0$ m/s. The acceleration $a = 0.7$ m/s² and time $t = 2.2$ s.

Step3: Substitute values into the formula

$v=0 + 0.7\times2.2$.

Step4: Calculate the final velocity

$v=1.54$ m/s.

Answer:

$1.54$ m/s