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Q.6. A wagon of mass 200 kg is tied to a horse by a rope. The horse pulls the wagon at a constant speed of 3 m $s^{-1}$, with a force of 40 N in the horizontal rope.
(a) Explain why the horse needs to exert a force in order to pull the wagon at a constant speed.
(b) With the aid of calculations, explain how the force in the rope changes if the horse accelerates at 0.1 m $s^{-2}$.

Answer 1

$$\begin{gathered} Dearstudent, \\ a)Thehorseneedtoexertaforcesoastochangethestateofrestofthewa \\ AsaccordingtoNewton\text{'}slawofmotiononlyforcecanbringachangeinthestataeofmotionofabody. \\ b)initialaccelerationofthewagon=\frac{40}{200}=0.2m/s^2 \\ Nowthenewaccelaeation=0.1m/s^2 \\ Forceintherope=200\times 0.1=20N \\ Regards \end{gathered}$$