of the Frisbee at What is the acceleration direction, measuring the angle from t

Question

of the Frisbee at What is the acceleration direction, measuring the angle from the positive x direction. hiker throws a stone from the upper edge of a vertical cliff. The gure. The stone hits the ground 3.20 s after being thrown and feels 4. (20 points) A m/s directed at 40.o° with the face of the clift, as stone's initial velocity is 25.0 shown in the fi resistance as it falls. (a) What is the height of the cliff? (b) How fast is the stone moving just before it hits the ground? 25.0 m/s iff Ground

Explanation / Answer

4a] using second equation of motion in vertical, h = ut + 0.5gt^2

h = 25*cos 40 degree*3.2 +0.5*9.8*3.2^2

= 111 m answer

b] Vx = 25 sin 40 degree =16.07 m/s

Vy = u+at= 25*cos 40 degree + 9.8*3.2 = 50.51 m/s

speed while hitting ground V = sqrt(16.07^2+50.51^2) = 53 m/s answer

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