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I just want to make sure I know I'm on the right track...

A human cannonball with a mass of 70kg experiences an impulse of 4.0x10^3 N*s for 0.35s

a) Calculate the force acting on the human cannonball.

b) How long was the barrel of the cannon? (Assume the force is applied only for the period of time that the cannonball is in the cannon.)

a) J = F (delta t)

4.0x10^3 = F (0.35)

F = 11428.57

b) J = delta P = 4.0x10^3

delta P = mv(f) - mv(i)

4.0x10^3 = 70 * V(f)

V(f) = 57m/s

E(k) = 0.5[mV(f)] - 0 ----- because it was at rest

=0.5(70 x 57)

=1995

F d = E(k)

11428.57 x d = 1995

d = 5.72m

therefore it was 5.7m long?

A human cannonball with a mass of 70kg experiences an impulse of 4.0x10^3 N*s for 0.35s

a) Calculate the force acting on the human cannonball.

b) How long was the barrel of the cannon? (Assume the force is applied only for the period of time that the cannonball is in the cannon.)

a) J = F (delta t)

4.0x10^3 = F (0.35)

F = 11428.57

b) J = delta P = 4.0x10^3

delta P = mv(f) - mv(i)

4.0x10^3 = 70 * V(f)

V(f) = 57m/s

E(k) = 0.5[mV(f)] - 0 ----- because it was at rest

=0.5(70 x 57)

=1995

F d = E(k)

11428.57 x d = 1995

d = 5.72m

therefore it was 5.7m long?

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