A 50-Kg Toboggan Is Coasting on Level Snow

Multiple Choice

A 50-kg toboggan is coasting on level snow. As it passes beneath a bridge, a 20-kg parcel is dropped straight down and lands in the toboggan. If KE₁ is the original kinetic energy of the toboggan and KE₂ is the kinetic energy after the parcel has been added, what is the ratio KE₂/KE₁.

A) 0.4
B) 0.6
C) 0.7
D) 0.8
E) 1