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A particle having a speed of 0.84c has a momentum of 10⁻¹⁶ kg · ms. What is its mass (in kg)?
a) 1.2 × 10⁻² kg
b) 1.5 × 10⁻² kg
c) 1.8 × 10⁻² kg
d) 2.1 × 10⁻² kg