"Constant change of direction" simply means on a curve.
The examples provided don't show a durn thing.
Answer:
10 Joule
Explanation:
The solution and answer are well written in the Pic above.
Ok so the formula is d=vi(t)+½at² and when you substitute it you should get 172.5meters
Answer: The elevator must be accelerating.
Explanation:
As the tension force is opposing to the the force of gravity on the load which is hung vertically, and the tension force can adopt any value in order to comply with Newton's 2nd law, if the tension force is less than the force due to gravity, this means that all system is not in equilibrium, so it must be accelerating.
If we assume that the downward is the positive direction, we can write:
mg - T = ma
If T = 0.9 mg, ⇒ mg (1-0.9) =0.1 mg = m a ⇒a = 0.1 g , in downward direction.
Solutions are basically a release from a problem. This is more than helpful.
