A man whose mass is 80kg climbs a staircase in 20 seconds a expends a power of 120 Watt. Find the height of the staircase

[tex]W=Fh cos\theta[/tex] Where F is the force i.e. weight of the man and h is the displacement and [tex]\theta[/tex] is the angle between displacement and force

Since F=mg and [tex]\theta[/tex] is zero

W = mgh

Also, Work=power* time

Therefore, Power*time=mgh

Substituting power for 120 W, time for 20 seconds, g as 9.81 m/s2 and m as 80 Kg

120*20=80*9.81*h and making he the subject of the formula

[tex]h=\frac {120*20}{80*9.81}=3.058103976 [/tex]

Therefore, the height is approximately 3.06 m

A man whose mass is 80kg climbs a staircase in 20 seconds a expends a power of 120 Watt. Find the height of the staircase​

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A man whose mass is 80kg climbs a staircase in 20 seconds a expends a power of 120 Watt. Find the height of the staircase