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james123
<Moderator's note: Moved from a technical forum and thus no template.>
A horizontal force of 80 N acts on a mass of 6 kg resting on a horizontal surface. The mass is initially at rest and covers a distance of 5 m in 0.92 s under the action of the force. Assuming there are no energy losses due to air resistance and therefore that the acceleration is constant:
A horizontal force of 80 N acts on a mass of 6 kg resting on a horizontal surface. The mass is initially at rest and covers a distance of 5 m in 0.92 s under the action of the force. Assuming there are no energy losses due to air resistance and therefore that the acceleration is constant:
- (a) Calculate the total energy expended in the acceleration.
(b) Plot a graph of the kinetic energy of the mass against time.
(c) Plot a graph of the kinetic energy of the mass against distance. Work done so far:
1. (a) 80 x 5= 400J
1 (b) a= 2d/t^2
a=(2x5)/0.92^2
a=11.8147448
a=11.81 m/s^-2
v=at
v=11.8147448 x 0.932
v=10.86956522
KE=1/2m(at)2
KE=0.5 x 6(10.86956522)^2
KE=354.4423442 J
1 (c) KE=1/2m(2ad)
KE=0.5 x 6(2 x 11.8147448 x 5
KE=354.442344 JMy main questions are, should I expect the same answers for both questions? seems a little odd to me.
Also, I'm completely stumped on the graphs, how to start them, how to plot them etc.
Any help is greatly appreciated!
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