# In Loading a Truck, a Man Lifts Boxes of 100 N Each Through a Height of 1.5 M. If the Man Lifts 4 Boxes per Minute, at What Power is He Working? (G = 10 M S−2) - Science

Sum

In loading a truck, a man lifts boxes of 100 N each through a height of 1.5 m.
If the man lifts 4 boxes per minute, at what power is he working?
(g = 10 m s−2)

#### Solution

Work done in lifting 4 boxes,
Work done
= (150) × (4) J
= 600 J
Time taken, (t) = 60 s
Now, we can calculate the power as,
Power = "Work done"/"Time"
So ,
Power = 600/60 W
= 10 W

So, the power is 10 W.

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#### APPEARS IN

Lakhmir Singh Science Class 9 Physics
Chapter 4 Work and energy
Hots Questions | Q 49.3 | Page 165