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A weightlifter expends 294 W of power lifting a weight to a height of 2 m in 10 seconds What mass has he lifted?
Wiki User
∙ 12y ago
assume a = 10(m/s)/s
power (w) = energy change/time
294 = (mass * 10 * 2)/10
then mass = (294*10 )/ (10*2)
= 147kg
Wiki User
∙ 12y ago
To calculate the mass lifted, first calculate the work done using the formula Work = Power x Time. In this case, Work = 294 W x 10 s = 2940 J. Then, use the formula for work done against gravity, which is Work = Force x Distance. Substitute the values 2940 J for Work, 2 m for Distance, and 9.81 m/s^2 for acceleration due to gravity to find the Force (Weight). Finally, use the formula Weight = mass x gravity, where gravity is 9.81 m/s^2, to determine the mass lifted.
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