Question

here is one small question ? what is the law of conservation of energy and object of mass 40 kg is raised to a height of 5 metre above the ground what is its potential energy if the object is allowed to fall find its kinetic energy when it's Halfway down ​

Answer 1

Answer:

Law of conservation of mass states that mass can not be creat or nor be destroyed in an chemical equation.

Explanation:

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Answer 2

Answer:

law of conservation of energy states that energy can neither be created nor destroyed.

PE = mgh = 40×10×5 = 2000 joules

so for covering 2.5 m

v^2-u^2 = 2aS

v^2 = 2×10×2.5 = 50

v = √50 m/s

KE = 1/2mv^2

= 1/2 × 40 × (√50)^2 = 20 × 50 = 1000 Joules