Home work need right answer

Question

A wealthy but not too smart bungee jumper decides to replace the bungee cord with a golden chain. Explain the physics of why this is a bad idea.

A 22 kg child runs with a speed of 3 m/s and jumps into a 38 kg wagon sitting still. What is the final speed of the wagon and child? Draw pictures, show calculations.

Apply conservation of momentum.

Answer 1

The first question involves common sense. Golden chains do not stretch.

Second question: Apply conservation of momentum.

m = mass of child

v = initial speed of child

M = mass of wagon

u = final speed of wagon and child = ?

mv = (m + M)u

u = mv / (m + M)

You have all the numbers. Plug them into the equation for u.