Question

From top of tower oh h 40m a ball is projected upward with a speed of 20 m per sec at an angle of elevatn of 30 then ratio of total time taken by ball ro hit the groynd to total time taken by ball to come at same level as top of tower

Answer 1

Answer:

4:2 is the ratio

Explanation:

time taken to reach maximum height in a horizontal projection

$H$=$\frac{20^{2} sin^{2} 30^{o}}{2*10}$

$H=\frac{400*0.25)}{20}$

h=5m

total height is 5+40=45 m

time of flight =$\frac{2*20*sin30}{10}$

                     =2 seconds

time of free fall= $\frac{\sqrt{2} *45 }{10}$

                       =$\sqrt{9}$

                       =3seconds

the total time taken to reach the ground is thus:

                                1+3=4 seconds

thus the ratio is 4:2

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Answer 2

Answer:

Please refer to the attachement below

Explanation: