Question

PLZ HURRY IT'S URGENT!!!!

A soccer player kicks a ball with a mass of 0.42 kg. The ball travels at a velocity of 28 m/s for 1.6 s until the goalie stops it.

What was the average acceleration of the soccer ball?
A. 0.06 m/s B. 17.5 m/s² C. 0.06 m/s² D. 17.5 m/s

Answer 1

(vf-v0)/t

vf=0 ...since it stops finally

v0=28 m/sec

t=1.6 sec

a=(0-28)/1.6

a=-17.5 m/s^2

so B is the answer,since magnitude is asked you neglect the negative.

notice that D is in m/sec(velocity unit)