P. 4809. The inhabitants of an Indian camp are shooting similar arrows into a wide wooden plank. Brainy Bear states that the red arrow penetrated twice as deeply into the plank as the blue arrow. He assumes that the resistive force exerted on the arrow is proportional to the depth of penetration. Thus he can answer to many different questions such as:
\(\displaystyle a)\) By what factor was the speed of the red arrow at the impact greater than that of the blue one?
\(\displaystyle b)\) Which arrow, the red or the blue one, had a longer braking time?
Deadline expired on 10 March 2016.