A cannon tilted up at a 29o angle fires a cannon ball at 83 m/s from atop a 11-m-high fortress wall. What is the ball's impact speed on the ground below?

v = 84.28 m/s

Explanation:

It is given that,

Initial velocity of a cannon, u = 83 m/s

Angle with which it is fired,

It is fired from a top a 11 m high fortress wall.

Let v is the ball's impact speed on the ground below. It can be calculated using the third equation motion.

So, the ball's impact speed on the ground below is 84.28 m/s.

explanation:

v=uf/(u-f)

= 5.-10/(5+10) convex lens has negative focal length

the answer is a)

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