A “doomsday” asteroid with a mass of 1.0 X 10 10 kg is hurtling through space. Unless the asteroid’s

A “doomsday” asteroid with a mass of 1.0 X
1010kg is hurtling through space. Unless the asteroid’s speed is
changed by about 0.20 cm/s, it will collide with Earth and cause tremendous
damage. Researchers suggest that a small “space tug” sent to the asteroid’s
surface could exert a gentle constant force of 2.5 N. For how long must this
force act?