physics
posted by ashley  HELP PLEASEE!!! .
A train is moving with a speed of 50 miles per hour. A man standing in the rear of a train car throws a ball toward the front of the train with a speed of 10 miles per hour. If a stationary observer outside the train sees this happen, what speed is the ball moving with? Explain your answer.

50 miles per hour +10 miles per hour = 60 miles per hour!