A ball is thrown vertically upward with a speed of +13.0m/s. a) How high does it

Question

A ball is thrown vertically upward with a speed of +13.0m/s. a) How high does it rise?
b) How long does it take to reach its highest point?
c) How long does the ball take to hit the ground after it reachesits highest point?
d) What is its velocity when it returns to the level from which itstarted?
a) How high does it rise?
b) How long does it take to reach its highest point?
c) How long does the ball take to hit the ground after it reachesits highest point?
d) What is its velocity when it returns to the level from which itstarted?

Explanation / Answer

a)we have:
     g   =   -g    and  v   =   0 => u^2   =   2*g*h
=>     h   =    (13)^2/ 2*9.8              =   8.62  m b) v = u - g*t    t   =   13 /9.8        =   1.32s c) Time of ascent and descent issame : 1.32 s. d) v    =   u +g*t    (in descent)           =   0+ 9.8*1.32   =   13 m/s             

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