Question: A train drives in the + direction with a speed of 4 / 5 relative to the ground. At a certain time, two balls are

A train drives in the + direction with a speed of 4/5 relative to the ground. At a certain
time, two balls are ejected so that they travel with a speed of 3/5(as measured in the
train frame) in opposite directions perpendicular to the trains direction of motion.
a. What are the balls speeds relative to the ground?
b. What is the angle that the path of each ball makes with the -axis in the ground
frame.

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