A 300 g-brick is dropped from a height of 20 m. At the halfway mark, the work done by gravity is 29 J.
What is work?
In physics, work is the energy transferred to or from an object via the application of force along a displacement.
First, we will calculate the force, which is equal to the weight of the object. We will use Newton's second law of motion.
w = m . g
w = 0.300 kg × 9.81 m/s² = 2.94 N
where,
- w is the weight.
- m is the mass.
- g is the gravity.
If the height is 20 m, the displacement (s) at the halfway mark is 10 m.
The work (W) done by gravity up to that point is:
W = w . s = 2.94 N . 10 m = 29 J
A 300 g-brick is dropped from a height of 20 m. At the halfway mark, the work done by gravity is 29 J.
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