Question

A ball is thrown at different angles with the same
speed u and from the same point; it has the same
range in both the cases. If y, and y, be the heights
attained in the two cases, then y, + y2 =....​

Answer 1

Answer:

u^2/2g

Explanation:

R1 = u^2 sin2(x1)/g

R2 = u^2 sin2(x2)/g

since R1= R2

x2 = 90-x1

H1= u^2 sin^2(x1)/2g

H2 =u^2 sin^2(x2)/2g

y1 + y2 = u^2/2g ( sin^2(x1) + cos^2(x1))

y1 + y2 = u^2/2g × 1

y1 + y2 = u^2/2g

Note :

sin(90-x1) = cosx1