Question

Pls tell answer I will thanks you

Answer 1

Answer:

u=40m/s

time to ascend=4 sec

Explanation:

u^2/2*10=80

u^2=80*2*10

u^2=160

u=square root of 160=40

u=40m/s

Time to ascend=u/g

=40/10

=4s

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