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A sky-diver jumps from a stationary balloon. His initial downwards acceleration is 10m/s².

Fig. 1.1 shows the directions of the air resistance and the weight of the sky-diver.

The mass of the sky-diver is 60 kg and his weight is 600 N.

(a) Explain, using ideas about the forces, why his initial downwards acceleration is 10m/s².​