Question

A car is stopped at a red light. When the light turns green, it increases its speed to 45miles/hour in 15 seconds. What is the car acceleration?

Answer 1

Acceleration = 3 miles per sec²

Step-by-step explanation:

A car is stopped at a red light that means speed of the car 'u' = 0

As the light turns green, speed of the car increases from 0 to 45 miles per hour,

v = 45 miles per hour

Duration for the increase in speed from 0 to 45 miles per hour is,

t = 15 seconds

By using formula to calculate the acceleration,

v = u + at

45 = 0 + a×15

a =
`(45)/(15)`

= 3 miles per sec²

Therefore, acceleration of the car is 3 miles per sec².