Answer to Question #282010 in Physics for Grace

Question #282010

A mass of 2.3 kg is initially moving at 5 m/s. A constant force of 15N is applied to the mass for 6 seconds. Find (a) the initial momentum, (b) final momentum.


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Expert's answer
2021-12-22T14:09:00-0500

(a)

pi=mvi=2.3 kg×5 ms=11.5 kg×ms.p_i=mv_i=2.3\ kg\times5\ \dfrac{m}{s}=11.5\ \dfrac{kg\times m}{s}.

(b)

FΔt=Δp=pfpi,F\Delta t=\Delta p=p_f-p_i,pf=FΔt+pi,p_f=F\Delta t+p_i,pf=15 N×6 s+11.5 kg×ms=101.5 kg×msp_f=15\ N\times6\ s+11.5\ \dfrac{kg\times m}{s}=101.5\ \dfrac{kg\times m}{s}

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