Kinematics

JEE Main level, single correct, medium

78 of 308

Question 78 of 308

Speeds of two identical cars are uu and 4u4 u at the specific instant. The ratio of the respective distances in which the two cars are stopped from that instant is

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Answer: (D) 1 : 16

Use u2=2u^2=2 as. a is same for both cases
s1=u2/2a;s2=16u2/2a=16 s1⇒s1:s2=1:16\mathrm{s}_1=\mathrm{u}^2 / 2 \mathrm{a} ; \mathrm{s}_2=16 \mathrm{u}^2 / 2 \mathrm{a}=16 \mathrm{~s}_1 \Rightarrow \mathrm{s}_1: \mathrm{s}_2=1: 16

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