Determine the coefficient of restitution e for a steel ball dropped from rest at a height h = 2.41 m above a heavy horizontal steel plate if the height of the second rebound is h2 = 0.82 m.

For such cases where frictional forces can be neglected,  and the object is dropped from rest onto a horizontal surface, coefficient of restitution is equivalent to:

e =  √(h/H)

where,

h = bounce height

H = drop height

so, using the formula we get:

e =  √(0.82/2.4)

Hence, e = 0.583 

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-the first industrial use of geothermal energy began near pisa, italy in late 18th century

-in 1904, italian scientist piero ginori conti invented the first geothermal electric power plant in which steam was used to generate the power

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