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ecogreen
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Homework Statement
Question 1
An alpha particle traveling at velocity u makes an oblique elastic collision with a helium atom moving with a velocity which is negligible compared to u. After the collision the alpha particle moves in the direction inclined at 30 degrees to its initial direction of motion.
What is the angle between the directions of motion of the helium atom and the initial direction of motion of alpha particle?
Question 2
A ball is released from a point a few metres above the ground. By considering the ball Earth system, discuss whether momentum is conserved before the ball reaches the ground.
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I don't really understand the situation in Question 1. For question 2, I do understand that momentum is conserved before the ball reaches the ground. Do I use m1v1=m2v2 or using total KE = total PE...