JEE PYQ: Laws Of Motion Question 10
Question 10 - 2021 | 18 Mar Shift 1] (Numerical)
A bullet of mass 0.1 kg is fired on a wooden block to pierce through it, but it stops after moving a distance of 50 cm into it. If the velocity of bullet before hitting the wood is 10 m/s and it slows down with uniform deceleration, then the magnitude of effective retarding force on the bullet is ‘x’ N. The value of ‘x’ to the nearest integer is ____.
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Answer: 10
Solution
$v^2 = u^2 + 2as$. $0 = 100 - 2a(0.5)$. $a = 100$ m/s$^2$. $F = ma = 0.1 \times 100 = 10$ N.
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