A light is at the top of a pole 80ft high. A ball is dropped at the same height from a point 20 ft from the light. Assuming that the ball falls according to s=16t^2, how fast is the shadow of the ball moving along the ground 1 second later?
Answer is 200ft/sec
How would I approach this question? (Related rates question)

Question

A light is at the top of a pole 80ft high. A ball is dropped at the same height from a point 20 ft from the light. Assuming that the ball falls according to s=16t^2, how fast is the shadow of the ball moving along the ground 1 second later?
Answer is 200ft/sec
How would I approach this question? (Related rates question)

anonymous · Answer

The easiest way is to draw a graph of the function s (16t^2). Using axes of time and speed :)