A 60.0-kg person drops from rest a distance of 1.20 m to a ...

[notis]

A 60.0-kg person drops from rest a distance of 1.20 m to a platform of negligible mass supported by an ideal stiff spring of negligible mass. The platform drops 6.00 cm before the person comes to rest.
 
  What is the spring constant of the spring?
  A) 2.56  105 N/m
  B) 3.92  105 N/m
  C) 5.45  104 N/m
  D) 4.12  105 N/m
  E) 8.83  104 N/m

Question 2

In the figure, a 5.00-kg block is moving at 5.00 m/s along a horizontal frictionless surface toward an ideal massless spring that is attached to a wall.
 
  After the block collides with the spring, the spring is compressed a maximum distance of 0.68 m. What is the speed of the block when it has moved so that the spring is compressed to only one-half of the maximum distance?
 
  What will be an ideal response?

[heyhey123]

Answer to Question 1

Answer: D

Answer to Question 2

Answer: 4.3 m/s

[notis]

Gracias!

[nyrave]

Excellent