3) A naughty student (no one here, that's for sure) launches a spitball (m = 3 g) at 25 m/s toward a fellow student, who is texting furiously (no one here?). The spitball strikes and sticks to the phone (m 112 g), which was at rest. Is the momentum conserved in this collision (5 points)? The texting student is surprised by the impact and releases the phone. What is the speed of the spitball + phone immediately after the collision (disregard gravity, 10 points)? If this sticking incident lasts 0.2 seconds, what is the force delivered to the phone by the spitball (5 points)?