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1)v=0,u=?,h=20m,g=-10m/s^2
According to third equation of free fall,
v^2-u^2=2gh
0-u^2=2*-10*20
-u^2=-400
u=√400=20m/s
2)According to first equation of free fall,
v=u-gt
0=20-10t
-10t=-20
t=20/10=2s
According to third equation of free fall,
v^2-u^2=2gh
0-u^2=2*-10*20
-u^2=-400
u=√400=20m/s
2)According to first equation of free fall,
v=u-gt
0=20-10t
-10t=-20
t=20/10=2s
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