Question

A racer starting from rest accelerate in a straight line at a constant rate of 6.25 m/s for 7 seconds. What are the racer velocity at the end of each time? If a parachute is deploy at this time and causes the racer to slow down uniformly at a rate of 2.5 m/s How long will it take the racer to come to stop?

Answer 1

I assume you mean a = 6.25 m/s^2
Please proof read what you type.

v = a t = 6.25 m/s^2 * 7 s
= 43.75 m/s

Now parachute, a = - 2.5 m/s^2 and Vi = 43.75 m/s

v = Vi + a t
0 = 43.75 - 2.5 t
t = 17.5 seconds