Question

no explanation just answers please

18. A crate is being pushed with a constant horizontal force, F. Four forces can be identified: 1) F, 2) the gravitational force, 3) the normal force, and 4) the frictional force. Which forces do NO work on the crate? Initial position Final position A) 1 & 4 B) 1 &2 & 3 C) 2 & 3 &4 D) 2 & 3 19. If objects A and B have the same mass, but object B has 9 times the kinetic energy of object A, what is true of their speeds? C) 9VB VA 20. A cart starts with velocity v and rolls up the frictionless path shown. At what point is the kinetic energy greatest? A) I B) 2 C)3 D) 4 200 m 21. A cart starts with velocity v and rolls up the frictionless path shown. At what point does the cart have the greatest total energy? A) 1 B) 2 C) 3 D) 4 E) all the same

Answer 1

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