A bullet of mass is fired with a velocity of 50 at an angle with the horizontal. At the highest point of its trajectory, it collides had on with a bob of massless string of length m and gets embedded in the bob. After the collision, the string moves to an angle of 120 . What is the angle

a) |
b) |
c) |
d) |

A bullet of mass is fired with a velocity of 50 at an angle with the horizontal. At the highest point of its trajectory, it collides had on with a bob of massless string of length m and gets embedded in the bob. After the collision, the string moves to an angle of 120 . What is the angle

a) |
b) |
c) |
d) |

1 Answer

127 votes

**(a)**

Velocity of bullet at highest point of its trajectory = 50 in horizontal direction.

As bullet of mass collides with pendulum bob of mass 3 and two stick together, their common velocity

As now under this velocity pendulum bob goes up to an angel 120 , hence

or

Comparing two answer of , we get

or

127 votes

127