I'm stuck on these 2 problems would so

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A1200 kg car traveling north at 10 m/s is rear-ended by a 2000 kg truck traveling at 30 m/s. what is the total momentum before and after the collision?

Lymphocytes known as blastocysts make antibodies that fight infection. select the best answer from the choices provided t f

You charge a parallel-plate capacitor, remove it from the battery, and prevent the wires connected to the plates from touching each other. when you increase the plate separation, what happens to the following quantities?