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QJEEM22Ph57f7: JEE Main 2022 Physics - Class 11 JEEM22Ph57f7 Solution: A bullet of mass 200   g having initial kinetic energy 90…

A bullet of mass 200 g having initial kinetic energy 90 J is shot inside a long swimming pool as shown in the figure. If it's kinetic energy reduces to 40 J within 1 s, the minimum length of the pool, the bullet has to travel so that it completely comes to rest is

JEE Main 2022 (Online) 28th July Evening Shift Physics - Work Power & Energy Question 55 English

Multiple Choice Options

  • A 45 m
  • B 90 m
  • C 125 m
  • D 25 m

Step-by-Step Verified Solution

12mx2=90

⇒12×0.2×x2=90,

x2=900

x=30 m/s

12mv2=40⇒v=23×30=20 m/s

20=30−a×1⇒a=−10 m/s2

0−x2=2as

s=x2−2a=30×302×10

=45 m

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