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Work, Power And Energy — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceWork, Power And Energy1 Mark
MCQ
A lorry and a car moving with the same $KE$ are brought to rest by applying the same retarding force, then:
  • A
    Lorry will come to rest in a shorter distance.
  • B
    Car will come to rest in a shorter distance.
  • ✓
    Both come to rest in a same distance.
  • D
    None of the above.
✓

Answer

Correct option: C.
Both come to rest in a same distance.

Work done by brakes $(F × d)$ transfers their $KE.$
$(\text{F}\times\text{d})=\frac{1}{2}\text{mv}^2$
Since both have same $KE$ and both subject to same force $(F).$
then distances $(d)$ are equal.

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