I have posted this problem 4 times on Chegg - and everytime the answer is incorr

Question

I have posted this problem 4 times on Chegg - and everytime the answer is incorrect...I can't figure it out...Please help

HW: Vectors and Projectiles » Projectile Motion Vi and Vf (5 Tiner Notes à Evaluate course contents * Timer Feedback Pri The soccer goal is 22.5 m in front of PSY. He kicks the ball giving it a speed of 11.5 m/s at an angle of 31 degrees from the horizontal. If the goalie is standing exactly in front of the net, find the speed of the ball just as it reaches her feet. Submit Answer Tries 6/99 Pravious Tries

Explanation / Answer

in Horizontal direction,

horizonatal distance, x = 22.5 m

hoironztal acc = 0 ( no acc in horizontal)

horizontal velocity, v0x = 11.5 cos31 = 9.86 m/s

time taken by soccer ball to reach golie,

t = x / v0x = 2.28 sec

in vertical,

v0y = 11.5 sin31 = 5.92 m/s

ay = - 9.8 m/s^2

vy = v0y + ay t = 5.92 - (9.8 x 2.28) = - 16.4 m/s

Speed = sqrt(vx^2 + vy^2)

= 19.2 m/s .........Ans

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