1. A player pushes a 250-g hockey puck over frictionless ice with aconstant forc

Question

1. A player pushes a 250-g hockey puck over frictionless ice with aconstant force, causing it to accelerate at 24 m/s^2 over adistance of 50.0 cm

Find the work done by the hockey player on the puck
and What is the change in the kinetic energy of the puck?

2. You can exert a horizontal force of 4.6 N on a textbook as youslide it .60m across a library table to a friend.

a. Calculate the work you do on the book
b. Your friend returns the book by pushing it with force of 6.2 Nat an angle of 30.0 below the horizontal. What is the work done byyour friend on the book?

Explanation / Answer

   Work=Fd. Use the F you just found andmultiply by .5 m. The answer you get is W and it is injoules.    The work done is equal to the change inkinetic energy. 2. W=Fd=4.6 times .6=...    You have to find the x component of theforce which = 6.2 times cos30=...    W=Fd=the value you just got times.6=...

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