A stone is dropped from a tower 100 meters above the ground. The stone falls past ground level and into a well. It hits the wate
1 answer:
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Momentum be P
On comaparing
- c=1
So
- b-3c=1
- b-3=1
- b=1+3
- b=4
and
- -a-b=-1
- -a-4=-1
- -a=-1+4=3
- a=-3
So the unit is
- DV⁴/F³
Answer:
a) 17.49 seconds
b) 13.12 seconds
c) 2.99 m/s²
Explanation:
a) Acceleration = a = 1.35 m/s²
Final velocity = v = 85 km/h =
Initial velocity = u = 0
Equation of motion
Time taken to accelerate to top speed is 17.49 seconds.
b) Acceleration = a = -1.8 m/s²
Initial velocity = u = 23.61\ m/s
Final velocity = v = 0
Time taken to stop the train from top speed is 13.12 seconds
c) Initial velocity = u = 23.61 m/s
Time taken = t = 7.9 s
Final velocity = v = 0
Emergency acceleration is 2.99 m/s² (magnitude)