Question

A object is vertically upward with a velocity of 20m/s

Answer 1

Answer:

Given that

A object is thrown vertically upward direction

let us take the y-axis inthe vertically upward direction with zero at the ground

Now,

V0 = +20m/s

a = -g = 10m/s

V = 0m/s

"If the object rise to height 'y' from the point of launch"

V2 = (V0)2 + 2a ( y - y0 )

We get ,

0 = (20)2 + 2(-10) (y-y0)

So , (y-y0) = 20m

The total time taken

h = -ut + 1/2gt2

Now , put

h = 25m

u = 29m/s

g = 10m/s

25 = -20t + ( 1/2 ) 10t2

5t2 - 20t - 25 = 0

t2 - 4t - 5 = 0

t2 - 5t + t - 5 = 0

t [ t-5 ] + 1[ t-5 ] = 0

t = 5s

Therefore total time taken (t) = 5 sec.

Explanation:

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