1. A ball is dropped off the top of a building that is 70 m high. The mass of the ball is 0.5 kg. When the ball hits the ground its KE is close to: (Hint: use conservation of the total energy E). r? KE = 342 Joules r? KE = 400 Joules r? KE = 420 Joules r? KE = 410 Joules 5points QUESTION 10 At a given instant a projectile, whose mass is 6 kg, is moving with a speed of 50 m/s and at a height of 200 m. Determine the projectile's total energy at this instant. r E = 19,370 Joules r? E = 19,260 Joules
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