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Consider a pebble of mass m=34 g launched from initial height h=7.1 m with speed v=5.1...

Consider a pebble of mass m=34 g launched from initial height h=7.1 m with speed v=5.1 m/s at angle θ=42 degrees above the horizontal. Just before the pebble lands on the ground is has a speed v=10.2 m/s. What is the work done on the pebble an external force (wind? air drag?) Provide your answer in joules, use three significant figures.

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