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jsmith613
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Homework Statement
A teacher demonstates the conservation of momentum using a collision between a moving an a stationary trolley. Both trolleys stick together AFTER the collision. She measures the velocities using a motion sensor and data logger. Explain why the velcoties before and after the collision must be constant if the principle is to be convincingly demonstrated
Homework Equations
The Attempt at a Solution
the momentum before and after MUST be the same
BUT initially the momentum = mass of moving trolley * its speed
after the total mass of both trolleys is greater than that of the lone trolley so the speed should be less. How does the question make sense