Question

A $500\, kg$ horse pulls a cart of mass $1500\, kg$ along a level road with an acceleration of $1 \,m / s ^{2}$. If the coefficient of sliding friction is $0.2$, then the horizontal force exerted by the earth on the horse is

• A. 300 kg wt
• B. 400 kg wt
• C. 500 kg wt
• D. 600 kg wt

Answer 1

Answer: (D)

$F=f_{k}=m a$
$F=f_{k}+m a$
$F=\mu m g+m a$
$f=m(\mu g+a)$
$\therefore F=(500+1500)(0.2 \times 10+1)$
$F=6000\, N\, F=600 \,kg -w t$