If a laptop of mass 1.4 kg is lifted to a table of height 0.8 m, how much gravitational potential energy is added to the laptop?A.11.0 JB.19.5 JC.1.1 JD.8.8 J
Question
If a laptop of mass 1.4 kg is lifted to a table of height 0.8 m, how much gravitational potential energy is added to the laptop?
A. 11.0 J
B. 19.5 J
C. 1.1 J
D. 8.8 J
Solution
The gravitational potential energy (PE) of an object can be calculated using the formula:
PE = mgh
where: m is the mass of the object, g is the acceleration due to gravity, and h is the height the object is lifted.
In this case, the mass (m) of the laptop is 1.4 kg, the acceleration due to gravity (g) is approximately 9.8 m/s² (on Earth), and the height (h) the laptop is lifted is 0.8 m.
Substituting these values into the formula gives:
PE = 1.4 kg * 9.8 m/s² * 0.8 m = 10.92 J
Rounding to one decimal place gives 11.0 J.
So, the answer is A. 11.0 J.
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