Răspuns :
EA=EB<=>mgh=mv^2/2 /:m
v^2=2gh
v=√(2gh)
v=√(2*10 m/s^2*180 m)
v=√3600 m/s
v=60 m/s
v=v0+at
a=g
v=vo+gt, vo=0<=>v=gt=>t coborâre=v/g=60 m/s/10 m/s^2=6 m/s*s^2/m=6 s
EA=EB<=>mgh=mv^2/2 /:m
v^2=2gh
v=√(2gh)
v=√(2*10 m/s^2*180 m)
v=√3600 m/s
v=60 m/s
v=v0+at
a=g
v=vo+gt, vo=0<=>v=gt=>t coborâre=v/g=60 m/s/10 m/s^2=6 m/s*s^2/m=6 s