Marble M moves to the right before it strikes marble N, which is initially at rest. Both marbles have the same mass, 4.1 g. After the collision, the marbles move in the directions shown in the diagram. Marble M moves away from the collision point with a speed of 23.9 cm/s. What is the initial kinetic energy of marble M?
A) 6.1 × 103 g . cm/s2
B) 7.2 × 103 g . cm/s2
C) 8.3 × 103 g . cm/s2
D) 9.4 × 103 g . cm/s2

Explain how plate tectonics have changed earth’s surface over time. include the role of plate tectonics in the creation of landforms.

Acave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. the lift is performed in three stages, each requiring a vertical distance of 10.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.90 m/s; (b) he is then lifted at the constant speed of 4.90 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 68.0 kg rescue by the force lifting him during each stage?

Explain how the energy of rubber ball is tranforned as it roll down a ramp. give evidence that the energy of the og the ball remains the same at all points on the ramp