Question

1.) A truck covers 40.0 m in 9.30 s while uniformly slowing down to a final velocity of 1.40 m/s.

(a) Find the truck's original speed.
m/s

(b) Find its acceleration.
m/s²

^2.) In a test run, a certain car accelerates uniformly from zero to 16.2 m/s in 2.55 s.

(a) What is the magnitude of the car's acceleration?
m/s²

(b) How long does it take the car to change its speed from 8.10 m/s to 16.2 m/s?
(answer in sec)

(c) Will doubling the time always double the change in speed?

Yes/No    Why?

Answer 1

Use equation of kinematics for one dimensional motion to find the required acceleration and initial speed as shown below