- #1
girl52
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Homework Statement
a ball w/ mass of .15kg and a velocity of 5m/s strikes a wall and bounces right back with v=3m/s. ball is in contact with wall for 0.1 sec, how much force did the wall exert on the ball?
Homework Equations
Ft=mvf-mvi
F=?
t=0.1
m=.15
vf=3m/s
vi=5
The Attempt at a Solution
0.1F=(.15*3)-(.15*5)
0.1F= -.30
F= -3 N
How could the force be negative?? did i do something wrong?