Question

ingrid is participating in a relay race. while jogging at 9 km/h, she tosses a relay stick at 16 km/h to her teammate, who is standing still. how fast is the relay stick moving relative to ingrid? 8 km/h 9 km/h 16 km/h 25 km/h

Explanation:

Step1: Define frame of reference

Ingrid is moving at a constant - speed of 9 km/h. When she tosses the relay - stick at 16 km/h to her teammate, the velocity of the stick relative to Ingrid is the velocity with which she throws the stick. The motion of Ingrid herself is not relevant when considering the velocity of the stick relative to her. So the speed of the relay stick relative to Ingrid is 16 km/h.

Answer:

C. 16 km/h