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Answer:
a) simple machines are devices which makes work easier and simple
Answer:
t= 5 s the particle will be on the highest position.

The maximum values of particle will at t= 10 s

The minimum values of particle will at t= 5 s

Explanation:
Given that

Time when the particle will be on the highest position:
When the Z component of r(t) will be maximum then the particle will be on the highest position.


It means at t= 5 s the particle will be on the highest position.
Position at t= 5



Speed :


The maximum values of particle will at t= 10 s



The minimum values of particle will at t= 5 s



Answer:
Explanation:
Given
acceleration of system a =1.2 m/s^2
Normal Force N=4.45 N
Force exerted F=20 N
Thus


-------1
Normal reaction 


therefore 

12 pounds
50% of 8 pounds is 4 pounds, so a 50% increase is adding 4 pounds, which is 8+4 which equals 12.