How much work is required to raise a 0.1 kg block to a height of 2 m and simultaneously give it a constant velocity of 3 m/s? b) What is the change in its potential energy? c) What is the power output of the upward force in watts?
(a)"W=mgh+\\frac{1}{2}mv^2"
"=(0.1\\times9.8\\times2)+(\\frac{1}{2}\\times0.1\\times3^2)"
"=2.41J"
(b) "\\triangle P=P_2-P_1 \\space" but "P_1=0"
"\\triangle P=mgh=0.1\\times9.8 \\times2=1.96J"
(c) "P=F\\times V=0.1\\times 9.8\\times3=2.94W"
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