Q36. Mary holds a 5 kg mirror against the wall 1.5 m above the ground for 20 s while Johnny nails it in place. What
is Mary's power output during this time period (0 W).
n27 A 70-Iturlist develons 21n natts of nower while nedaling at a constant velocity of 7 meters per second east.

Aspring is used to stop a 50-kg package which is moving down a 20º incline. the spring has a constant k = 30 kn/m and is held by cables so that it is initially compressed 50 mm. knowing that the velocity of the package is 2 m/s when it is 8 m from the spring and neglecting friction, determine the maximum additional deformation of the spring in bringing the package to rest.