The amount of matter in an object is called Mass.
Mass = (2*KE) / v²
∴ the answer is 200/49
Explanation:
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Answer:
A uniform meter rule of mass 100 g is balanced on a fulcrum at mark 40 cm by suspending an unknown mass m at the mark 20 cm. ... When the balancing mass is moved then the resultant moment is the difference of clockwise moment and anticlockwise moment.