After a short time, the moving sled with the child aboard reached a rough level surface that exerts a constant frictional force
of 54 Newtons on the sled. How much work must be done by friction to bring the sled with the child to a stop
2 answers:
Answer:
Wf = –750J
Explanation:
The full solution can be found in the attachment below.
This problem involves the concepts of conservation of momentum and energy.
The potential energy of the sled and child combined is constant since thehy are moving in a level surface.
To find the initial velocity of the sled with child we use the principle of momentum conservation to calculate the v1 which is the commovelocity of the child and sled.
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- Force=60N
- Mass=4kg
Answer:
Explanation:
To answer the question, we just need to consider the motion along the horizontal direction.
The component of the initial velocity of the ice skater along the x-direction is:
where u = 2.25 m/s is the initial velocity and is the angle.
The component of the final velocity of the ice skater along the x-direction is
where u = 4.65 m/s is the final velocity and is the angle.
The acceleration along the x-direction is given by
where
t = 120 s is the time
Substituting,