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Frequency = 75 Hz. Speed = 45 m/s
= 100 cm ⇒ 45 m = 45 x 100 cm = 4500 cm
45 = 30 + m Subtract 30 from both sides: 15 = m
kinetic_energy = ½mv² = ½ × 45 kg × (10 m/s)² = 2250 Joules.
It is 45/100.