Question

A car going 50km/h accelerates to pass a truck. Five seconds later the car is going 80km/h? What is the acceleration?

please help me

Answer 1

`5/3\ "m/s"^2`

Explanation:

Initial velocity of car`= "50 kmph" = 50 cancel"kmph" × 5/18\ "m/s"/cancel"kmph" = 125/9\ "m/s"`

Final velocity of car`= "80 kmph" = 80 cancel"kmph" × 5/18\ "m/s"/cancel"kmph" = 200/9\ "m/s"`

Acceleration of car is

`"a" = ("v – u")/"t" = (200/9\ "m/s" - 125/9\ "m/s")/"5 s" = 5/3\ "m/s"^2`