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Question1

An old oaken buck of mass 6.75 kg hangs in a well at the end of a rope. The rope passes over a frictionless pulley at the top of the well, and you pull horizontally on end of the rope to raise that bucket gradually a distance of 4.00m.

(a) How much work do you do on bucket in pulling it up?

(b) How much work does gravity do on bucket?

Question2

A 6.7 g bullet is fired into a 1.3 kg ballistic pendulum. The bullet come out from block with a speed of 137 m/s, and block rises to a greatest height of 10 cm.

find out an initial speed of the bullet. The acceleration due to gravity is 9.8 m/s2.

Answer should be in units of m/s

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