To a ground-based observer, what is the speed of a moving ball tossed backward at 30 km/hour on a train moving forward at 90 km/hr?
A) 150 km/hr
B) 60 km/hr
C) 30 km/hr
D) 90 km/hr
E) 2700 km/hr

Question

Quizplus · Accepted Answer

The relative speed of the ball to a ground-based observer is the speed of the train minus the speed at which the ball is tossed backward, which is 90 km/hr - 30 km/hr = 60 km/hr.

To a Ground-Based Observer, What Is the Speed of a Moving