- #1
ph_lover3294
- 9
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Homework Statement
a tinnes ball of mass 150 gm moves with velocity 11.2 m/s to collide with a racket , after collision it is rebounded with vilocity 7 m/s ...find :-the impulse of the racket on the ball.
Homework Equations
I = m (delta) v
what i want to know .. is
when do we use the vilocity with the negative direction ??
i mean when we answer it
can we calculate
0.15 * ( 11.2-7)= 0.63 kg.m/s
or
0.15* (11.2-(-7))=2.73 kg.m/s
so what is the right answer ?!