a body of mass 0.8 kg has initial velocity (3i-4j) m/sec and final velocity (-6j+2k) m/sec. find the change in K.E of the body?
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Answer:
Initial kinetic energy = 1/2mass × magnitude of initial velocity
=1/2×0.8×5=2J. (lul=√4×4×3×3=√5)
final kinetic energy=1/2×m×v=1/2×0.8×40=16J.
(lvl=√6×6+2×2=√40)
change in kinetic energy=final-initial=16-2=14J
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