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Alina [70]
3 years ago
5

The Sl unit for speed is

Physics
1 answer:
34kurt3 years ago
4 0

Answer:

m/s (meters per speed)

Explanation:

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a golfer tees off and hits a golf ball at a speed of 31 m/s and an angle of 35 degrees. how far did the ball travel before hitti
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Ans: R = Ball Travelled = 92.15 meters.

Explanation:
First we need to derive that formula for the "range" in order to know how far the ball traveled before hitting the ground.

Along x-axis, equation would be:
x = x_o + v_o_xt +  \frac{at^2}{2}

Since there is no acceleration along x-direction; therefore,
x = x_o + v_o_xt

Since v_o_x = v_ocos \alpha and x_o=0; therefore above equation becomes,

x = v_ocos \alpha t --- (A)

Now we need to find "t", and the time is not given. In order to do so, we shall use the y-direction motion equation. Before hitting the ground y ≈ 0 and a = -g; therefore,

=> y = y_o + v_o_yt -  \frac{gt^2}{2}
=> t =  \frac{2v_o_y}{g}

Since v_o_y = sin \alpha; therefore above equation becomes,
t = \frac{2v_osin \alpha }{g}

Put the value of t in equation (A):

(A) => x = v_ocos \alpha \frac{2v_osin \alpha }{g}

Where x = Range = R, and 2sin \alpha cos \alpha = sin(2 \alpha ); therefore above equation becomes:

=> R = (v_o)^2 *\frac{sin(2 \alpha )}{g}

Now, as:
v_o = 31 m/s

and \alpha = 35°
and g = 9.8 m/(s^2)

Hence,
R = (31)^2 *\frac{sin(2 *35 )}{9.8}

Ans: R = 92.15 meters.

-i
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