The height of object with respect to ground is 400cm. If the potential energy of that object is 840J. Find the mass of object.
12kg
21kg
20kg
13kg
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Answer:
21kg
Explanation:
assume , g= 10m/s
h = 4m (given)
PE = mgh
840= m *10*4
m = 84/4
m = 21 kg
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