# physics

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A space aircraft is launched straight up. The aircraft motor provides a constant acceleration for 10seconds, then the motor stops. The aircraft's altitude 15seconds after launch is 2km. Ignore air friction.
Determine (i) the acceleration, (ii)the maximum speed reached in km/h, (iii) the speed(in km/h) of the aircraft as it passes through a cloud 4km above the ground.

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