A panda, Molly, decides to take a slide down an incline plane of 30 degrees. She

Question

A panda, Molly, decides to take a slide down an incline plane of 30 degrees. She starts at the top. Her initial speed is 0 m/s. Her mass is 75 kg. The length down the hill is 250 m. At the bottom of the hill is Molly's identical twin sister, Dolly. Dolly is at rest. When Molly collides with Dolly, they hug and do not there go.There is no friction.

A. Is this an inelastic or an elastic collision? Why?

B. What is conserved in this collision? What is not conserved in this collision?

C. What is the velocity of the twins immediately after the collision?

D. What is the total kinetic energy before the collision?

E. What is the total kinetic energy after the collision?

F. Are your answers for parts D and E different? Should they be different? If they are different, where did the energy go?

Explanation / Answer

a) perfectly inelastic because the bodies are sticking as a single unit. b) momentum is conserved .energy is not c) 25m/s .during the incline with a = 5m/s2 for 250M we get speed = 50. after collision conservation of momentum gives 25. d)93750. simple 0.5*mv^2 for 50m/s^2 e) 46875 with twice mass and half velocity. f) excess energy went in uniting the two bodies as a single unit . in pandas case their fat skin absorned all the excess energy

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