What speed will the spacecraft crash into lunar surface

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An unmanned spacecraft is in a circular orbit around the moon, observing the lunar surface from an altitude of 49.0km . To the dismay of scientists on earth, an electrical fault causes an on-board thruster to fire, decreasing the speed of the spacecraft by 26.0m/s .If nothing is done to correct its orbit, with what speed (in km/h) will the spacecraft crash into the lunar surface?

Reference no: EM13248786

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