12. A 155 kg crate of supplies is dropped from a helicopter hovering at a height...

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12. A 155 kg crate of supplies is dropped from a helicopter hovering at a height of 325 meters above a lake. A small parachute reduces its acceleration so it is moving at 30.0 m/s when it hits the water. The crate descends another 11.0 meters under water before stopping and floating to the surface. a. What was the work done on it by air resistance as it fell? b. What was the work done on it by the water in bringing it to rest (and prior to the crate floating to the surface)? What was the average upward force the water exerted on it? C. 12. A 155 kg crate of supplies is dropped from a helicopter hovering at a height of 325 meters above a lake. A small parachute reduces its acceleration so it is moving at 30.0 m/s when it hits the water. The crate descends another 11.0 meters under water before stopping and floating to the surface. a. What was the work done on it by air resistance as it fell? b. What was the work done on it by the water in bringing it to rest (and prior to the crate floating to the surface)? What was the average upward force the water exerted on it? C.

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To answer these questions we need to use principles of physics specifically work and energy a To cal... View the full answer