Question

Find the kinetic energy of a ball of mass 500 gm moving with a speed of 20 m/s. Solve it Ans-100j

Answer 1

Ok

Answer is 5 J

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Answer 2

1. Explanation:

Using the rule: (a+b) (a-b) = a^2 - b^2

Our equation: (2+sqrt3) (2-sqrt3) = 2^2 - sqrt3^2

= 4 - 3 = 1

Notes:

1.1 The definition of square root:

sqrt(n) * sqrt(n) = n.

This is by the definition of square root:

…. If r = sqrt(n)

…. then r X r = n.

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