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The cable of a crane is lifting a 750 kg girder. The girder increases its speed from 0.25 m/s to 1.25 m/s in a distance of 4.1 m.?
How much work is done by gravity?
How much work is done by tension?
1 Answer
- ?Lv 73 years agoFavorite Answer
work done by gravity
Wg = -m*g*h = 750kg * 9.8m/s² * 4.1m = -30 135 J
and you might not need the sign in your answer -- it might be understood to be negative.
work done by tension
Wt = increase in KE - Wg
Wt = ½ * 750kg * (1.25² - 0.25²)m²/s² + 30135 J = 30 698 J
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