A rock rolling down an incline-velocity and force

AI Thread Summary
To calculate the velocity of a 20-ton spherical rock rolling down a 400-meter incline, the conservation of energy principle is applied. Initially, the rock possesses gravitational potential energy, which converts to kinetic energy as it reaches ground level. The velocity can be determined using the formula derived from energy conservation, where potential energy equals kinetic energy. Additionally, the force exerted on the rock can be calculated using Newton's second law, factoring in its mass and acceleration. Understanding these concepts is crucial for solving the problem accurately.
NDbogan
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The question is:
a spherical rock weighing 20 tons starts rolling down a steep incline from a height of 400 metres. Calculate the velocity when it reaches the ground level. What is the force exerted on the rock?


I've tried to work this out but I just can't seem to grasp exactly what I'm missing.

Any help will be really appreciated.
 
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Conservation of energy ::biggrin::
 
hmm...could you explain it a bit further.
 
Use conservation of energy. The energy the rock has at the start and what is the energy converted to when it reaches the bottom
 

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