A 100 kg basketball player can leap straight up in the air to a height of 80 cm, as shown in Figure P7.50. You can understand how by analyzing the situation as follows:

a. The player bends his legs until the upper part of his body has dropped by 60 cm, then he begins his jump. Draw separate free-body diagrams for the player and for the floor as he is jumping, but before his feet leave the ground.

b. Is there a net force on the player as he jumps (before his feet leave the ground)? How can that be? Explain.

c. With what speed must the player leave the ground to reach a height of 80 cm?

d. What was his acceleration, assumed to be constant, as he jumped?

e. Suppose the player jumps while standing on a bathroom scale that reads in newtons. What does the scale read before he jumps, as he is jumping, and after his feet leave the ground?

Transcribed Image Text:

60 cm 80 cm Starts Leaves Max height ground