An automobile travelling with a speed of 60,, | vedclass

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Question

d) The stopping distance, $S \propto {u^2}$

$&rArr;$ $\frac{{{S_2}}}{{{S_1}}} = {\left( {\frac{{{u_2}}}{{{u_1}}}} \right)^2} = {\left( {\frac{{120}

Vedclass · Accepted Answer

$80$

Vedclass · Answer

d) The stopping distance, $S \propto {u^2}$

$&rArr;$ $\frac{{{S_2}}}{{{S_1}}} = {\left( {\frac{{{u_2}}}{{{u_1}}}} ight)^2} = {\left( {\frac{{120}}{{60}}} ight)^2} = 4$

$&rArr;$ ${S_2} = 4 	imes {S_1} = 4 	imes 20 = 80\,m$

An automobile travelling with a speed of $60\,\,km/h,$ can brake to stop within a distance of $20 \,m$. If the car is going twice as fast, i.e. $120\, km/h$, the stopping distance will be ........... $m$

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