14. We use Eq. 8-18, representing the conservation of mechanical energy. We choose the reference position for computing Uto be at the ground below the cliff; it is also regarded as the “final” position in our calculations. (a) Using Eq. 8-9, the initial potential energy is given by Ui= mghwhere h= 12.5 m and 1.50 kgm=. Thus, we have 12KU K Umvmghmviiffi+=++12022which leads to the speed of the snowball at the instant before striking the ground: vmmvmghvgh=+FHGIKJ2122wherevi= 14.0 m/s is the magnitude of its initial velocity (not just one component of it).
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This note was uploaded on 05/17/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.