a) How much work is required to lift a 2.5- kg concrete blockto a height of 1.5

Question

a) How much work is required to lift a 2.5- kg concrete blockto a height of 1.5 m?___J b) A man pushes a lawn mower on a level lawn with a force of212 N. If 52% of this force is directed downward, how much work isdone by the man in pushing the mower 4.8 m?___J c) A 1045 kg automobile is pulled b a horizontal tow line witha net force of 869 N. What is the acceleration of theauto?____m/s^2 a) How much work is required to lift a 2.5- kg concrete blockto a height of 1.5 m?___J b) A man pushes a lawn mower on a level lawn with a force of212 N. If 52% of this force is directed downward, how much work isdone by the man in pushing the mower 4.8 m?___J c) A 1045 kg automobile is pulled b a horizontal tow line witha net force of 869 N. What is the acceleration of theauto?____m/s^2

Explanation / Answer

Given : a )         Mass ( m ) = 2.5kg     Height ( s ) = 1.5 m     g = 9.8 m/s2      As we know that    Work ( W ) = F .s    But F = m a    W = m g s         = --------- J c )       Mass ( m ) = 1045 kg      Net force ( F ) = 869 N    Accleration ( a ) = ?       As we know that     Force ( F ) = m a Accleration ( a ) = F / m                          = ------------- m/s2 Plugin the values and solve it Plugin the values and solve it               

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