Answer:
Option d) only its mechanical energy is conserved
Explanation:
Since, mechanical energy of a system is the sum of its kinetic energy and potential energy.
Potential energy depends directly on height while kinetic energy depend on the speed of the body.
When the rock is dropped its potential energy decreases while its kinetic energy increases while the potential energy is maximum at the top and kinetic energy was zero.
Therefore, these two energies are inter convertible and when one increases the other decreases and vice-versa keeping the overall mechanical energy conserved.
Yes, the friction is acting in the opposite direction you are pushing.
Answer:
At a convergent boundary where both plates are continental, mountain ranges grow and earthquakes are common. At a transform boundary, there is a transform fault and massive earthquakes occur but there are no volcanoes. Processes acting over long periods of time create Earth's geographic features.
Explanation:
I am not 100% sure but i think it is true.
Answer:
5m/ .
Explanation:
Mass of the crate (m) = 9.0 Kg
Horizontal force applied to the crate(F) = 45 N .
Now,
According to the Newton's Law's of motion ,
F = ma , where a represents the acceleration of body of mass m when subjected to the horizontal force F under frictionless conditions .
Thus,
45 = 9a
a = 5 m/ .
Thus , the resulting acceleration of the crate will be 5m/ .