<p>&#65279;&#65279;&#65279;&#65279;1.)&#160;&#65279;A constant force of 20 N is

Question

<p>&#65279;&#65279;&#65279;&#65279;1.)&#160;&#65279;A constant force of 20 N is applied to an object of mass 8.0 kg at an angle of 25 degrees with the horizontal. &#160;What is the work done by this force on the object if it causes a displacement of 2.0 m along the horizontal direction?</p>
<p>2.) A child pulls a 3.00-kg sled across level ground at constant velocity with a light rope that makes an angle 30.0 degrees above horizontal. &#160;The tension in the rope is 5.00 N. &#160;Assuming the acceleration of gravity is 9.81 m/s^2, what is the coefficient of friction between the sled and the ground.</p>

Explanation / Answer

w=f.dcos25
w=20*2*cos25=36.25

2)mg=Tcos30

  =5*cos30/(3*9.81)=0.22

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