A truck moves on its own horizontally on a frictionless road. A big box is dropped in the bed of the truck, and they continue to coast.
a) Does the horizontal momentum of the system(truck+box) change? Justify answer with relevant theorems.
b)Does the speed of the truck change? If so, what is the new speed?
The Attempt at a Solution
I posted this somewhere else and need a second opinion. I personally thought that since the combined mass would be larger, then it would have a larger momentum. Here's the answer I received from someone else. -
a)Momentum remains same. The speed of the truck decreases so that the momentum remains same.
b)As mentioned above, the speed decreases.
What do you think?