An object is released from rest and falls in free fall motion. The speed v of the object after it has fallen a distance y is given by

v^{2} = 2gy.

In an experiment, v andy are measured and the measured values are used to calculate g. If the percent uncertainty in the measured value of v is 4.13% and the percent uncertainty in the measured value of y is 5.00%, what is the percent uncertainty in the calculated value of g? (Do not enter units for this answer.)

A small block travels up a frictionless incline that is at an angle of 30.0° above the horizontal. The block has speed 4.21 m/s at the bottom of the incline. Assume

g = 9.80 m/s^{2}.

How far up the incline (measured parallel to the surface of the incline) does the block travel before it starts to slide back down?