According the work-energy theorem, the change in the kinetic energy of one object, is equal to the net work done on it.
Since the puck is initially at rest, the change is kinetic energy is just the final kinetic energy of the puck.
Assuming that the net force is horizontal, and causes a horizontal displacement also, we can find the net work on the puck as follows:

$W_{net} = F_{net} * \Delta X = 0.56 N * 0.84 m = 0.47 J = 470 mJ (1)$

As we have already said, (1) is equal to the final kinetic energy of the puck:
⇒ Kf = 470 mJ (2)

8 0

2 years ago

A rock is at the top of a 20m tall hill. The rock has a mass of 10kg. How much potential energy does the rock have?

Rashid [163]

Answer:

Ggghhhjhhhhhbdufdusty

4 0

2 years ago

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The speed of a car during a trip is represented in the graph. Compare distance and displacement at four hours into the trip.

yawa3891 [41]

The correct option is (D) Both, distance traveled and displacement are 300 km.

Why?

To solve the problem we must remember what distance and displacement means.

Distance means the ground/space covered in a certain time, in physics, distance is equal to the product of the speed and time.

Displacement means the distance between the starting and ending point of an object after (or not) being in motion.

So, for the problem, using the graphic we are asked to find the distance and displacement in 4 hours

We can see that in 4 hours, the distance covered is 300km, also, we can see that the difference (in distance) between the starting point at 0 hours and the ending point at 4 hours is equal to the distance covered in the same time.

Hence, we can see that the correct option is D) Both, distance traveled and displacement are 300 km.

Have a nice day!

3 0

3 years ago

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