Answer to Question #288385 in Physics for Junard

Question #288385

A 2500 kg delivery truck contains 125 cavans of rice, each of mass 500 kg. Its moving at a speed of 5m/s. How many cavans of rice must be unloaded at a nearby grocery so that the track can move at 9m/s and yet maintain the same momentum( Identify the given, unknown and equation to use.)

1
Expert's answer
2022-01-18T10:24:36-0500

Initial momentum:


pi=(M+N1m)vi,pf=(M+Nfm)vf,pi=pf, (M+N1m)vi=(M+Nfm)vf, Nf=(M+N1m)viMvfmvf=71, ΔN=NiNf=54.p_i=(M+N_1m)v_i,\\ p_f=(M+N_fm)v_f,\\ p_i=p_f,\\\space\\ (M+N_1m)v_i=(M+N_fm)v_f,\\\space\\ N_f=\dfrac{(M+N_1m)v_i-Mv_f}{mv_f}=71,\\\space\\ \Delta N=N_i-N_f=54.


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