Achild and sled with a combined mass of 49.0 kg slide down a frictionless hill that is 7.50 m high at an angle of 26 ◦ from horizontal. the acceleration of gravity is 9.81 m/s 2 . if the sled starts from rest, what is its speed at the bottom of the hill?

12.12 m/s

Explanation:

Given

mass of child

height of hill

inclination

Conserving Energy at top and bottom Point of hill

Potential Energy at Top =Kinetic Energy at bottom

Explanation:

The final speed of the child-sled system is determined by means of the Principle of Energy Conservation:

answer: the correct answer is   air pressure at the top of mount everest is higher than at the bottom of the grand canyon.

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explanation: