2. A 5-kg block of wood hangs a pendulum by a string of 4 meters long. When a 30-gm bullet is fired at close range into the block and becomes embedded, the block swings to a height where the string makes an angle of 30 degrees with the vertical. Find:
a. The recoil height of the block;
b. The recoil speed of the block; and
c. The recoils speed of the bullet.
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Answer:
c)the recoils speed of the bullet.
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