24. A woman throws a baseball from the front of an airplane to the back. From the perspective of the woman, the baseball travels at an average speed of 15 m/s. To an observer on the ground, the airplane is traveling at a constant speed of 820 km/h. What is the speed of the baseball from the perspective of the ground observer?
25. An asteroid is traveling in a straight line at a constant speed of 327 m/s. How long will it take for a displacement of 732 km to occur?
24. So for these questions, you add if they're going in the same direction and you subtract if it's in the opposite direction
for the ground observer, since the ball is moving in the opposite direction of the plane, it would be
820 km/h - 15 m/s
15 m/s * 60 s/min * 60 min/hour = 54000 m/h, 54000 m/h * 1000 m/km = 54 km/h
820 km/h - 54 km/h = 768 km/h to the ground observer
By the way, I don't think it's safe for someone to throw a baseball that fast in an airplan
25. It's travelling at constant speed so acceleration is 0 d = v * t t = d / v t = 732 000 / 327 t= 2238.5 secs = 37.31 minutes
P.s i used 732 000 and not just 732 because you have to work in S.I units and 1km = 1000m