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Question1

Man pushing a mop across a floor causes it to undergo two displacements. First has the magnitude of 154 cm and makes the angle of 126° with a positive x axis. The resultant displacement has the magnitude of 147 cm and is directed at an angle of 36.0° to positive x axis. Find out the magnitude and direction of the second displacement.

Question2

A 9.00- bullet, affecting horizontally with an initial speed, embeds itself in a 1.20- pendulum bob that is firstly at rest. The length of pendulum is = 0.730. After the collision, pendulum swings to one side and comes to rest while it has gained a vertical height of 14.0

Is kinetic energy of the bullet-bob system immediately after the collision greater than, less than, or the similar as kinetic energy of the system just before collision?

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