Question

5) A car getting off a highway decelerates along the ramp at a rate of 2.5 meters per second'. If the car is on the ramp for 10 seconds and slows to a speed of 13 meters na second, what was its speed before it began decelerating?​

Answer 1

Step-by-step explanation:

Let us assume initial speed as 'u' and final speed as 'v' , acceleration as 'a' and time on the ramp as 't'

v = 13 m/s

a = -2.5 m/s^2 (negative because

decelerating)

t = 10 s

u = ?

v = u + at

or u = v - at

= {13 - (-2.5) x 10} m/s

= (13 + 25) m/s

= 38 m/s

Therefore, initial speed u = 38 m/s