o 5/4/2016 11:00 AM A Time Remaining: 58 M 7 S Gradebook Question 2 of 8 Map sap

Question

o 5/4/2016 11:00 AM A Time Remaining: 58 M 7 S Gradebook Question 2 of 8 Map sapling learning this question was written by Sean Cordry at Walters State Community College Tina is looking out a window and throws marble straight downward toward the sidewalk below at a speed of 4.00 m/s and the window is 39.0 meters above the sidewalk Answer the two questions below, using three significant digits. Part A What is the speed of the ball (Vf) when it hits the ground? Number m/ s (Remember: enter a magnitude.) Part B: After 1.90 s, how far down has the marble travelled? Number m (Enter distance as a positive value.) Previous Next Save And Exit

Explanation / Answer

Part a)   Here, V2 - U2 = 2gH

=> Vf2 = 2 * 9.8 *39 +   42

=> Vf   =   27.935   m/sec         -------------->   speed of ball when it hits the ground .

Part b)    Here, S = ut + 1/2 * gt2

                                 => S = 4 * 1.90 + 1/2 * 9.8 * 1.902

                                                 =   25.289 m

=> far down marble travelled = 25.289 m

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