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A hot air balloon is ascending vertically with a speed of 5.4 m/s. While looking out over the edge of the basket, Josh's sunglasses fall off and start falling towards the ground. (a) If the sunglasses take 7.0 seconds to reach the ground, how far above the Earth was the balloon when the sunglasses started to fall? (b) With what velocity do the sunglasses hit the ground? (c) what is the acceleration of the hot air balloon?