A pendulum consists of a 2.0-kg block hanging on a 1.5-m length string. A 10-g bullet moving with a horizontal velocity of 900 m/s strikes, passes through, and emerges from the block (initially at rest) with a horizontal velocity of 300 m/s. To what maximum height above its initial position will the block swing

The maximum height above its initial position is:

Explanation:

Using momentum conservation:

(1)

Where:

Let's find v(fb) using equation (1)

We need to find the maximum height, it means that all kinetic energy converts into gravitational potential energy.

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the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this