Question

please answer this question ​

Answer 1

Answer:

t=21.4

Step-by-step explanation:

Given:-

initial velocity(u)=10m/s

height (s)=20m

acceleration due to gravity (a)=10m/s^2

To find:- time(t)

we know

s=ut+1/2at^2

putting in the values

we get

20=10t+1/2*10t^2

20=10t + 5t^2

by converting it into standard form we get

5t^2 + 10t +20=0

by applying some mathematical formulas ( depends on which class you are in, if you're a student of class ten then you'll understand how I get it) we get

t=21.4secs.

hope this will help .

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