Question

At what height would the gravitational potential energy have a value of 73.7 joules for a 15 kilogram object? Note that acceleration due to gravity is 9.8 meters/second2.
A.
0.5 meters
B.
1.2 meters
C.
2.0 meters
D.
3.1 meters
E.
3.4 meters

Answer 1

By PE=mgh

h=0.5 metre

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Answer 2

Given :

Potential energy of object , U = 73.7 J .

Mass of object , m = 15 kg .

Acceleration due to gravity , $g=9.8\ m/s^2$ .

To Find :

The height of object .

Solution :

We know , potential energy of object of mass m and height h is given by :

$U=mgh$

Therefore , $h=\dfrac{U}{mg}$

Putting value of m , g and U in above equation .

We get :

$h=\dfrac{73.7}{15\times 9.8}\\\\h=0.5\ m$

Therefore , correct option is A .

Learn More :

Work and energy

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