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Q.

A ball is thrown at different angles with the same speed u and from the same points and it has same range in both the cases. If y1 and y2 be the heights attained in the two cases, then y1 + y2 =

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a

u2/g

b

2u2/g

c

u2/2g

d

u2/4g

answer is C.

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Detailed Solution

y1=(usin⁡θ)22g and y2=usin⁡90∘−θ22gor        y2=(ucos⁡θ)22g∴ y1+y2=u22gsin2⁡θ+cos2⁡θ=u22g
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A ball is thrown at different angles with the same speed u and from the same points and it has same range in both the cases. If y1 and y2 be the heights attained in the two cases, then y1 + y2 =