1. calculate the magnitude of the linear momentum for the following cases. (a) a proton with mass 1.67 10-27 kg, moving with a speed of 5.75 106 m/s (b) a 15.0-g bullet moving with a speed of 460 m/s 2. drops of rain fall perpendicular to the roof of a parked car during a rainstorm. the drops strike the roof with a speed of 15 m/s, and the mass of rain per second striking the roof is 0.071 kg/s. (a) assuming the drops come to rest after striking the roof, find the average force exerted by the rain on the roof. (b) if hailstones having the same mass as the raindrops fall on the roof at the same rate and with the same speed, how would the average force on the roof compare to that found in part (a)