Sam's job at the amusement park is to slow down and bring to a stop the boats in the log ride. If a boat with its riders has a mass of 1,200.0kg and is drifting in at 0.5m/s, how much work (in J) does Sam do to stop it?

The work required by Neymar to push a box of soccer balls on a horizontal, frictionless floor to accelerate it from a speed of zero to v is W1. The work required by Neymar to accelerate the box of soccer balls on the same floor, from v to 2v is W2. The ratio of W2 to W1 is   The correct answer is 3 but I don't know how they got to that answer

A woman swimming upstream is not moving with respect to the shore. Is she doing any work? If she stops swimming and merely floats, is work done on her? Explain comprehensively.

Cart Mass, mc  . 284 kg Angle, θ 49 degrees Distance, d . 75 m Equilibrium . 240 Velocity 1 . 664 m/s Velocity 2 . 672 m/s Velocity 3 .670 m/s Average Velocity .669 m/s What is the kinetic Energy ? Using the average velocity, calculate the cart's change in Kenetic Energy. KE = (1/2) mv2

Question 8 Questions #8-9 start with the same description. A 1,100 kg horse is walking at 2.0 m/s. What type of energy is being described? Your answer: O chemical O elastic O gravitational O kinetic

Releasing some frustration at the end of the semester, you throw your physics book (mass of 4.3 kg) off of a 24 m tall building. You throw your book so that it has a speed of 3 m/s right after you let go. What is the kinetic energy of your book after you let go? (in J) 12.9 1.01×103 206 0 19.4 How how fast is your textbook moving right before it lands? For now, ignore friction. (in m/s) 21.9 17.5 24.7 21.5 If friction is NOT negligible, and 350 J of the textbook's energy is converted to thermal energy as it falls, how fast is it moving just before it lands? (in m/s) 17.8 17.5 12.8 25.3 25.0

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A woman runs up a flight of stairs. The gain in her gravitational potential energy is 1000 J. If she runs up the same stairs at half the speed, her gain in gravitational potential energy will be . . .  Group of answer choices 500 J 2000 J 100 J 1000 J

A musket ball, 0.2 kilograms, is shot with the speed of 313 meters per second into a metal can holding some clay.  The musket ball penetrates 0.134 meters into the clay before coming to a stop. What is the kinetic energy of the musket ball before it hits the clay? How much work does the clay do in stopping the musket ball, question mark? What forces the clay exert in stopping the musket ball?

How much work must be done by frictional forces in slowing a 1000 g car the velocity from 400 cm/s to rest? 88 J 8 J O 341J 409000J