A) truck will cover less distance before stopping
B) car will cover less distance before stopping
C) both will cover equal distance
D) none of these
Correct Answer: B
Solution :
The mass of truck is much more than that of car. From Newtons second law \[F=ma\] ... (i) Also, \[{{v}^{2}}={{u}^{2}}-2\,as\] ... (ii) When car and truck stop; \[v=0\]and \[a=\frac{F}{m}\] from Eq. (i), Then, \[0={{u}^{2}}-2\frac{F}{m}s\] \[\Rightarrow \] \[s=\frac{{{u}^{2}}\,m}{2\,F}\] \[\Rightarrow \] \[s\propto m\] Hence, car will cover less distance before stopping.
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