Kyle, a 95.0 kg 95.0 kg football player, leaps straight up into the air (with no horizontal velocity) to catch a pass. He catches the 0.430 kg 0.430 kg ball precisely at the peak of his jump, when he is 0.488 meters 0.488 meters off the ground. He hits the ground 0.0333 meters 0.0333 meters away from where he leapt. If the ball was moving horizontally when it was caught, how fast was the ball traveling?

Explanation:

In the period 1911–1913, together with Henry Norris Russell, he developed the Hertzsprung–Russell diagram. In 1913 he determined the distances to several Cepheid variable stars by parallax, and was thus able to calibrate the relationship, discovered by Henrietta Leavitt, between Cepheid period and luminosity.

Ejnar Hertzsprung, (born Oct. 8, 1873, Frederiksberg, near Copenhagen, Den.—died Oct. 21, 1967, Roskilde), D