Question

the work done in a lifting weights of mass 10 kg at a height of 2 metres from the ground

a) 19.6 J
b) 196 J
c) 1960 J
d) zero​

Answer 1

ANSWER

Given,

m=10kg

h=2m

g=9.8m/s

2

Work done, W=mgh

W=10×9.8×2=196J

The correct option is B.

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Answer 2

Answer: option(b) 196 J

Explanation:

Given: Mass of an object = 10 kg

Displacement (height) = 2 metres

To find: Work done

Solution :

We know, that :

$\boxed{W=FS}$

Where, F = ma

(In this case, a=g )

Now putting values in the above formula ;

W = F × S

= ma × S

= 10 × 9.8 × 2

= 196 J

Hence, work done = 196 J

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Know More :

• Dimensional formula for Work =

$[ML^2T^{-2}]$

• Other units of work :

1. Electron volt (eV) :

1eV=1.6×$10^{-19}J$

2. Mega electron volt (MeV) :

1 MeV =1.6×$10^{-13}J$

3. Kilo Watt-hour (kWh) :

1 kWh = 3.6×$10^6$

4. Calorie (cal) : 1 cal = 4.186 J