Work Power and Energy 5 Question 9

11. A bullet of mass M is fired with a velocity 50m/s at an angle θ with the horizontal. At the highest point of its trajectory, it collides head-on with a bob of mass 3M suspended by a massless string of length 10/3m and gets embedded in the bob. After the collision, the string moves through an angle of 120. Find

(1988, 6M)

(a) the angle θ,

(b) the vertical and horizontal coordinates of the initial position of the bob with respect to the point of firing of the bullet. (Take g=10m/s2 )

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Answer:

Correct Answer: 11. (c)

Solution:

  1. p=2Km or pm,

m1m2=14p1p2=12



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