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Physics.....Force Question? Watch

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    A boat of mass 800kg is pulled along the sand at constant velocity by a cable attached to a winch.the cable is at an angle of 15° to the horizontal.

    IF the tension in the cable is 4kN show that:
    The normal reaction of the sand on the boat is about 7kN
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    Looking at the vertical forces only, the up forces are R and the vertical component of 4000KN and the down force of 800 x 9.8. The forces equate to zero so you can work out R.
    I know this post is 2 days old, but I felt like answering it anyway.
 
 
 
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