You are in an airplane,traveling relative to the ground at 500 km/hr.You throw a baseball toward the front of the plane at a speed of 50 km/hr.How fast would someone on the ground say the baseball is moving?
A)550 km/hr
B)50 km/hr
C)500 km/hr
D)450 km/hr.

Question

Quizplus · Accepted Answer

The speed of the baseball relative to the ground is the sum of the speed of the airplane and the speed at which you throw the baseball. Since the airplane is moving at 500 km/hr and you throw the baseball at 50 km/hr towards the front, someone on the ground would observe the baseball moving at 500 km/hr + 50 km/hr = 550 km/hr.

You Are in an Airplane,traveling Relative to the Ground at 500