An object with a kinetic energy of 40 J is stopped in a distance of 0.01 m The a
ID: 1621635 • Letter: A
Question
An object with a kinetic energy of 40 J is stopped in a distance of 0.01 m The average force that stops the object is A. 10,000 N. B. 4,000 N. C. 400 N. D. 40 N E. 0.4 N. A box is moved 20 m across a smooth floor by a force making a downward angle with the floor, so that there is effectively a 10 N force acting parallel to the floor in the direction of motion and a 5 N force acting perpendicular to the floor. The work done is A. 300 J. B. 200 J. C. 100 J. D. 20 J. E. 5.0 J A bullet is fired into a wall and comes to rest. Considering only the bullet as the system we can say that A. the total kinetic energy is conserved. B. the momentum is conserved. C. neither total kinetic energy nor momentum is conserved. D. both total kinetic energy and momentum are conserved. A toy car and a toy truck at rest have a compressed spring in between them. The truck has more mass than the car. The spring is released and the two cars move in opposite directions. Which of the following is true? A. The magnitude of the truck's momentum is the same as the car's. B. The magnitude of the truck's momentum is larger than the car's C. The magnitude of the truck's momentum is smaller than the car's. D. It is not possible to tell which has more momentum without knowing the speeds.Explanation / Answer
Q. 10:
work don e= FS = 10 N ( 20 ) = 200 J
( option B)
Q.11 option B ( only momentum is conserved)
Q. 12
Momentum is same for both ( optionA)