5. A boy kicks a football from ground level with an initial velocity of 20 m/s a

Question

5. A boy kicks a football from ground level with an initial velocity of 20 m/s at an angle 60° above the hits the ground? horizontal. What is the horizontal distance to the point where the football 1. 20 m 2. 18 m 3. 60 m 4. 35 m 5. 30 m 6. A ball is thrown horizontally from the top of a 20 m high hill. It strikes the ground at an angle of 45°. With what speed was it thrown? 1. 14 m/s 2. 20 m/s 3. 28 m/s 4. 32 m/s 5. 40 m/s 20 m 7. A 20.0 gram mass is attached to a 120 cm long string as shown in the figure. The tension in the string is measured to be 0.200 N. What is the angle a? 1.13.6 2.18.7° 3.11.2 4.22.4 5.24.6

Explanation / Answer

5. R=u2 Sin2?/g =202 Sin120÷9.8=35.34 m

6.

u=root(2gh)

u=19.79m/s

7. TCos?=mg

Cos?=mg÷T =20×10-3×9.8÷0.2

Alpha=11.47 degrees..

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