Question

find out velocity of the stone in 3s​

Answer 1

Let,

u = Initial velocity of stone

H = Maximum height attained by the stone

v = final velocity at maximum height = 0

t = time taken to attain maximum height = 3s

a=−g= acceleration due to gravity

(i) We know that,

v=u+at

0=u−g×3

u=3g=3×9.8ms

−2

u=29.4ms

−1

(ii) From the equations of motion , we know that ,

s=ut+

2

1

at

2

H=29.4×3+

2

1

9.8×9

H=88.2+44.1

H=132.3m