O www.webassign.net/web/Student/Assignment-Responses submit?depa 15759145 A plac

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O www.webassign.net/web/Student/Assignment-Responses submit?depa 15759145 A placekicker must kick a football from a point 36.0 m (about 40 yards) from the goal. Half the crowd hopes the ball will clear the crossbar, which is 3.05 m high. When kicked, the ball leaves the ground with a speed of 23.0 m/s at an angle of 50.0° to the horizontal. (a) By how much does the ball clear or fall short of clearing the crossbar? (Enter a negative answer if it falls short.) t may be helpful to first determine the time required for the ball to reach the goal, m (b) Does the ball approach the crossbar while still rising or while falling? O rising O falling Need Help? Master Submit Answer Save Progress -1 points SerPSET94 P032.Ml. A home run is hit in such a way that the baseball just clears a wall 16.0 m high, located 136 m from home plate. The ball is hit at an angle of 37.0e to the horizontal, and air resistance is negligible. (Assume that the ball is hit at a height of 1.0 m above the ground.) (a) Find the initial speed of the ball. (b) Find the time it takes the ball to reach the wall. (c) Find the velocity components of the ball when it reaches the wall y component Find the speed of the ball when it reaches the wall.

Explanation / Answer

here,

the initial speed , u = 23 m/s

theta = 50 degree

the horizontal distance , x = 36 m

using equation of trajectory

the vertical height , y = x * tan(theta) - g *x^2 /( 2 * v^2 * cos^2(theta))

y = 36 * tan(50) - 9.8 * 36^2 /( 2 * 23^2 * cos^2(50))

y = 13.8 m

so, the ball is (y - 3.05 = 10.75 m ) above the cross bar

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