JEE Main 2022 · 28 Jul · Shift 2 · Physics Q5

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PhysicsSingle correct+4 / -1Question 5 of 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

A bullet fired horizontally into a long pool of water.

45 m

90 m

125 m

25 m

Answer and worked solution

Official answer: A

Speeds. 90 J at 0.2 kg is 30 m/s; 40 J is 20 m/s. So the (constant) retardation is 10 m s $^{-2}$ .

Distance to stop $\frac{30^2}{2\times10}=45$ m.

(A)

Topics:Work-energy theorem Motion in a straight line

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JEE Main 2022 · 28 Jul · Shift 2, Physics question 5