Posted by Betsy on .
A marble is dropped from a height of 10 m. A 2nd marble is rolled off a 10 m table at 5 m/s. A 3rd marble is fired at 5 m/s at an angle of 45 degrees off the table. Which one is going 15 m/s when it hits the ground?

AP Physics 
drwls,
Calculate the velocities at ground impact for each case and compare them. Can you do any of them? The first marble's velocity is sqrt(2gH)
None of them will be travelling at 15 m/s at impact, but one is closer than the others.