Question

2. A race car starts at 400 m/s and then stops in 20 seconds. Calculate acceleration. Acceleration=final velocity - initial velocity/ change in time
A. -20 m/s2
B. 40 m/s2
C. 20 m/s2
D. 55 m/s2

Answer 1

It is -20m/s2
400-0
————- = -20
20