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?

Acceleration = 3 miles per sec²

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 =

  = 3 miles per sec²

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

the answer is kevlar

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2