Question

9. An object moving at a constant velocity accelerates at a constant rate of 20 m/s for a distance of

100 m. At the end of the acceleration the object has a velocity of 80 m/s. What was its velocity
before accelerating?

Answer 1

I believe the answer is roughly 49m/s

Step-by-step explanation:

List all given variables:

Accel=20m/s^2

Dist=100m

Final velocity=80m/s

Initial velocity=?

Using the equation i=sqrt(f^2-2a*d) where i =initial velocity, f=final velocity, a=acceleration, and d=distance, we can plug in the known values and solve for initial velocity

i=sqrt(80^2-2*20*100)

i=sqrt(6400-4000)

i=sqrt(2400)

i=48.99, rounded up to 49m/s as the initial velocity

This is my speculation about this answer would appreciate if anyone can confirm this.