Aisha dropped an object of mass 4 Kg from a height of 10m.
The object has a speed of 0 m/s at position A and is at a height
op
A
of 10m above the ground. At position B, the object is 6m above
B
the ground. At position C, the object is 4m above the ground,
At point D, the object is mere picometer (almost at 0 meter height)
above the ground. Assume negligible air resistance throughout
the motion. Use this information to fill in the table. (g=10m/s2)
1411
Answers
Explanation:
If an object whose mass is 20 kg is dropped from height of 10m, what is the maximum kinetic energy it will attain?
When it’s still at the height of 10m, the object has potential energy. The formula for this is Mass x Gravitational Acceleration x Height. (m*g*h)
Mass = 20 kg
Gravitational Acceleration = 9.81 meters/(second^2)
Height = 10m
Multiplying, we get: 20 x 9.81 x 10 x (kg*meters/(second^2)) * meters
Simplifying: Potential energy = 1,962 Newton * meters = 1,962 Joules
If the object falls 10m to the ground, then right before it hits, all of its potential energy will have been converted into kinetic energy (plus a tiny bit of air friction energy lost in heat). So the kinetic energy will be 1,962 Joules *minus* some tiny amount (whatever amount of energy was lost heating up the air on the way down).
Once it actually hits the ground, its potential energy and kinetic energy will both be zero (after things have settled down). All of the kinetic energy that it had just before impact will have been converted into heat energy (heating up the object, ground, and nearby air at the point of impact). It will also make a loud “thump” sound, so a very tiny fraction of this energy will also be in the form of acoustic wave energy, most of which eventually turns into heat.
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