Pluto has a mass of 1.27x1022 kg and a radius of 1.14x109 m. (a) An astronaut throws a rock at 12 m/s at an angle of 25° above horizontal from a height of 3.25 m above
the surface. How far horizontally does the rock travel before hitting the surface of Pluto?

One hazard of space travel is debris left by previous missions. there are several thousand masses large enough to detect by radar orbiting the earth, but there are far greater numbers of very small masses such as flakes of paint. calculate the force exerted by a 0.110 mg chip of paint that strikes a space shuttle window at a relative speed of 5.00 ✕ 103 m/s and sticks, given the collision lasts 6.00 ✕ 10-8 s. such a collision chipped the window of the ill-fated challenger in june 1983, causing $50,000 of damage.