Calculating Work and Speed (Physics)
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Calculating Work and Speed (Physics)

[From: ] [author: ] [Date: 11-05-09] [Hit: ]
With what speed will it hit the ground?-1) x = vt = (0.2) v² = v₀² + 2ax = (20)² + 2(9.v = √(988) = 31.......
1.A shopper pushes a grocery cart with a force of 75N at a constant speed of 0.75m/s foe an hour around a store. How much work does she do on the cart?

2. A ball of mass 240g is falling through the air with a speed of 20.0 m/s at a height of 30m. With what speed will it hit the ground?

-
1) x = vt = (0.75)(3600) = 2700 m

W = F*x = (75)(2700) = 202500 J


2) v² = v₀² + 2ax = (20)² + 2(9.8)(30) = 988

v = √(988) = 31.432 m/s
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