(a) The magnitude of the net force on the crate is -26.46 N.
(b) The net work done on the crate while it is on the rough surface is -17.2 J.
(c) The speed of the crate when it reaches the end of the rough surface is 0.61 m/s.
<h3>Magnitude of net force on the crate</h3>
The magnitude of the net force on the crate is calculated as follows;
F(net) = F - Ff
where;
F(net) = F - μmg
F(net) = 290 - (0.351)(92)(9.8)
F(net) = -26.46 N
<h3>Net work done on the crate</h3>
W = Fd
W = -26.46 x 0.65 = - 17.2 J
<h3>Speed of the crate </h3>
acceleration of the crate, a = F/m
a = -26.46/92
a = -0.288 m/s²
v² = u² + 2as
v² = 0.865² + (2)(-0.288)(0.65)
v² = 0.374
v = 0.61 m/s
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Work is defined as the process of energy transfer to the motion of an object through the application of force. ... Power is defined as the amount of energy transferred in unit time. The SI unit of power is the watt.
You need to have power or energy, to be able to work. When you reach another lesson, you will learn about time, which is the flow of work you have done. You need more work than time for your work to count.
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