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Question

Physics Question on projectile motion

Two buildings are 30 m apart. The speed with which a ball must be thrown horizontally from a window 150 m above the ground in one building so that it enters a window 27.5 m from the ground the other building is

A

2 m s−1^{-1}

B

6 m s−1^{-1}

C

4 m s−1^{-1}

D

8 m s−1^{-1}

Answer

6 m s−1^{-1}

Explanation

Solution

R=u2(h1−h2)gR = u \sqrt{\frac{2(h_1 -h_2)}{g}}