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Grade: 12

                        

two balls are thrown with same speed instant from the same point at angle of protection alpha and buta with horizontal. it they are simultaneously hit the top and bottom of vertical pole.the values of (cos alpha) /(cos bita)

4 years ago

Answers : (1)

Vikas TU
12157 Points
							
For top,
apply eqns. of motion in y direction.
h = usinalpha*t – 0.5*g*t^2.....................(1)
Range x = ucosalpha*t …...............(2)

For Bottom,
in x direcn.
x = ucosbeta*t........................(3)
from eqns (1)  and (2),
ucosbeta*t = ucosalpha*t
cosalpha/cosbeta = 1.
4 years ago
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