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iamkristing
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[SOLVED] collision and impulse
A 1.0 kg ball drops vertically onto a floor, hitting with a speed of 20 m/s. It rebounds with an initial speed of 5 m/s.
(a) What impulse acts on the ball during the contact?
kg·m/s
(b) If the ball is in contact with the floor for 0.020 s, what is the average force exerted on the floor?
N
p=m*v
deltap=J
F=m(deltav)/deltat
For (a) i used p=m*v and deltap=J
so I got (1*-20)-(1*5)=-25
and for (b) i used that F=(m*deltav)/deltat
which came out to be... 1(-25)/.020=0.5 N
both answers were wrong and I'm not sure what is wrong with the formulas I used...
Any help is appreciated! Thanks!
Homework Statement
A 1.0 kg ball drops vertically onto a floor, hitting with a speed of 20 m/s. It rebounds with an initial speed of 5 m/s.
(a) What impulse acts on the ball during the contact?
kg·m/s
(b) If the ball is in contact with the floor for 0.020 s, what is the average force exerted on the floor?
N
Homework Equations
p=m*v
deltap=J
F=m(deltav)/deltat
The Attempt at a Solution
For (a) i used p=m*v and deltap=J
so I got (1*-20)-(1*5)=-25
and for (b) i used that F=(m*deltav)/deltat
which came out to be... 1(-25)/.020=0.5 N
both answers were wrong and I'm not sure what is wrong with the formulas I used...
Any help is appreciated! Thanks!