An average force of 280 N acts for 1.2 seconds on a 78 kg circus performer as he is shot out of a cannon. (a) What impulse is applied to the performer? (b) What is the speed of the performer as he leaves the cannon?

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Answer 1 · 2018-04-05T18:06:06

I tried this:

The Impulse #I# can be evaluated as:

#I=F_(av)Deltat=280*1.2=336Ns#

For the velocity we use the Theorem of Impulse and Change in Momentum consisdering the initial velocity of the performer as zero.

#I=Deltap#

#F_(av)Deltat=mv_f-mv_i#

#336=(78*v_f)-(78*0)#

rearranging:

#v_f=336/78=4.3m/s#