An explosion breaks a rock into three parts in a horizontal plane. Two of them go off at right angles to each other. The first part of mass 1 kg moves with a speed of 12 ms⁻¹ and the second part of mass 2 kg moves with speed 8 ms⁻¹. If the third part flies off with speed 4 ms⁻¹ then its mass is

Options

(a) 5 kg
(b) 7 kg
(c) 17 kg
(d) 3 kg

Correct Answer:

5 kg

Explanation:

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