Question

A particle moves along the x_ axis from x=0 to x=5m under the influence of a force F( in N) given by. The work done by the force is then
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Answer 1

Explanation:

workdone is equal to 5F

Answer 2

Question :-

A particle moves along the x_ axis from x=0 to x=5m under the influence of a force F( in N) given by. The work done by the force is then

Answer :-

$\: \bold{ ★ \: w=∫ \: Fdx}$

$\small { \mathrm{</p><p></p><p>={∫}^{0}_{5} \: \: 7−2x+3x^{2} \: dx</p><p>}}$

$\small{ \mathrm{=[7x− \frac{ {2x}^{2} }{2} + \frac{ {3x}^{2} }{3} ] ^{5} _{0}}}$

$\small { \mathrm{=[7x− {x}^{2} </p><p> + {x}^{3} ] ^{5} _{0} }}$

$\small{ \mathrm{=[7×5− {5}^{2} </p><p> + {5}^{3} ]−[0−0+0]}}$

$\small{ \mathrm{=[35−25+125]−0}} \\ \\ { \small{ \bold{=135J}}}$

• Answer is 135 J not 70J