A kangaroo jumps to a vertical height of 2.5m. How longwas it in the air before

Question

A kangaroo jumps to a vertical height of 2.5m. How longwas it in the air before returning to Earth? I cannot wrap my mind around this one. Pleasehelp! This will be on my test on Monday. This type ofquestion is supposed to come from Chapter 2 in Giancoli's Physics6th edition, but I cannot find another question like it. A kangaroo jumps to a vertical height of 2.5m. How longwas it in the air before returning to Earth? I cannot wrap my mind around this one. Pleasehelp! This will be on my test on Monday. This type ofquestion is supposed to come from Chapter 2 in Giancoli's Physics6th edition, but I cannot find another question like it.

Explanation / Answer

   Vy2=Vy02 -2gh    = 0 - (2 * 9.8 *-2.5)    = 40 so Vy = 6.632   So again Vy,= Vy - gt    0 = 6.632 - (9.8 x t)    So t = 0.645 And the total time needed for the Kangaroo to come back to theground is = 2 t                      = 2 x 0.645                      = 1.29 sec.

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