Question

Draw a picture and FBD

imilar to P5-8; 15 points] You are running along a sidewalk with a constant but unknown speed. Ahea of you there is a stationary 25 kg wagon with frictionless wheels. In order to have some fun you to leap horizontally into the wagon. Now that you are in the wagon, you measure the velocity of you and the wagon to be 8.50 m/s. Determine the velocity you had before your collision with the wagon. Also, name and describe the type of collision involving you and the wagon. Is your velocity before the collision reasonable? Explain. (You may assume your mass is 60 kg.) 2. [Si

Answer 1

By conservation of linear momentum we have,

60 x v = 85 x 8.5

v = 12.04 m/s is the velocity of running person initially before collision.

The collision is perfectly in elastic as both the body after collision travel together and there is a loss of energy in internal forces to get the combination moving at common speed.

The speed attained by person initially is somewhat less practical as fastest human speed recorded till now is around 10 m/s only.