A ball accelerates uniformly at -2.00 m/s^2. If the ball was initially moving at 0.20 m/s and the ball travels for 7.00 s, then what was its final velocity?

A. -1.8 m/s

B. -14.2 m/s

C. +13.8 m/s

D. -13.8 m/s

How do I calculate this? @perl :)

Question

A ball accelerates uniformly at -2.00 m/s^2. If the ball was initially moving at 0.20 m/s and the ball travels for 7.00 s, then what was its final velocity?

A.  -1.8 m/s

B.   -14.2 m/s

C.  +13.8 m/s

D.  -13.8 m/s

How do I calculate this? @perl :)

perl · Answer

we can use the formula

change in velocity = average acceleration * time 

or
vf - vi= a*t 
or
vf = a*t + vi

anonymous · Answer

okay, so is average acceleration -2.00 m/s^2 and the time is 7.00 s ?

perl · Answer

vf = (-2)*7 + 0.2

anonymous · Answer

ahh okay, thanks so much!! :D