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simple physics question?
1. a rock is shot horizontally from a cliff 90m high. How long does it take to hit the ground.
2 a motocycle rider wants to jump a 179 m wide canyon. He arranges a ramp on one side so he will be launched pointed 30 degree above the horizontal. What minimum speed will be needed to just reach the other side. a. 30 m/s b. 40 m/s c. 35m/s d. 45 m/s
3.At what angle should a water gun be aimed in order for the water to land with the greatest horizontal range. a.0 b.45 c.30 d.90
4 A stone is thrown at an angle of 30 degrees above the horizontal from the top edge of a cliff with an initial speed of 12m/s/ A stop watch measure the stone's trajectory time from the top of the cliff to the bottom at 5.6s. What is the height of the cliff? a.58 b. 150. c. 120. d. 180 meters
this is urgent!!!\
1 Answer
- JánošíkLv 79 years agoFavorite Answer
1)
s = v×t + a×t²/2
-90 = 0×t + (-9.8)×t²/2
t = 4.286 s < - - - - - answer
2)
r = v² × sin(2×θ) / g
179 = v² × sin(2×30) / 9.8
v = 45 m/s < - - - - - answer d
3)
45° < - - - - - answer b
4)
Vv = 12×sin(30) = 6 m/s
-h = 6×5.6 + (-9.8)×5.6²/2 = -120
h = 120 m < - - - - - answer c
