1.
Rupinder is standing on a bridge overlooking a river. (a) He throws a 25 g rock
straight up into the air with a speed of 12 m/s and measures that it takes 6.8 s to hear
a splash. How high is the bridge? (b) Now that he knows how high the bridge is,
Rupinder throws two identical rocks at 5.5 m/s, one upwards and one downward.
How long apart are the two splashes? (c) What is the difference in speed of the two
rocks when they each hit the water?

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