College Physics
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Transcribed Image Text:A rock with a mass of 2.80 kg is moving with velocity (6.20î – 1.40ĵ) m/s. (HINT: v² = ✓ · V.)
(a) What is the rock's kinetic energy (in J) at this velocity?
X
Find the square of the initial velocity using the hint given, and then use the definition of kinetic energy, KE = mv²,
(b) Find the net work (in J) on the rock if its velocity changes to (8.00î + 4.00ĵ) m/s.
J
to calculate the kinetic energy. J
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