Answer:
V^2 =U^2 +2gh.
Given U =0 ,h=80m
So v^2= 0+2×10×80 =1600,SO V= 40m/s
And from Newton's first equation
v =u+gt ,40=0+10×t,t=4sec.
So answer is 4 sec
Explanation:
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Answer:
V^2 =U^2 +2gh.
Given U =0 ,h=80m
So v^2= 0+2×10×80 =1600,SO V= 40m/s
And from Newton's first equation
v =u+gt ,40=0+10×t,t=4sec.
So answer is 4 sec
Explanation: