Object thrown up, Please help me with physics?

[Jaholbrook983]

An object is thrown upwards with a speed of 13m/s. How long does it take to reach a height of 4.0m above the projection point while descending?

 

[climberguy12]

x=1/2at^2+vot

4=1/2(-9.8)t^2+13t

quadratic formula...
a=-4.9,b=13,c=-4

t=.355,2.298
the first one would be on the way, up so it is 2.298 seconds

make it a good day

 

[climberguy12]

x=1/2at^2+vot

4=1/2(-9.8)t^2+13t

quadratic formula...
a=-4.9,b=13,c=-4

t=.355,2.298
the first one would be on the way, up so it is 2.298 seconds

make it a good day