This specific question applies the concept of relative velocity. Relative velocity is describes as the velocity of an object with respect to another object, whether static or moving. For this problem, the correct statement is t<span>he spotter above the tunnel will observe the speed of the spy as 95 km/h, and the person in the car will observe the speed of the spy as 200 km/h. The following are the justification, relative speed of the spotter at the tunnel is equal to velocity (Vss) = velocity spy relative to the ground (Vsg) + V ground relative to the spotter (Vgs). Thus, V = 95 + 0 km/h = 95 km/h. Note that the sign of velocity is dependent on the direction, hence, opposite direction is equal to negative velocity. For the second condition, velocity of the spy in reference person in the car is equal to velocity of the spy reference to ground plus the velocity of the ground reference to the person in the car. Thus, V = 95 km/h + 105 km/h = 200 km/h. Please be cautious in assigning the sign of the velocity.</span>
Answer:
2.1 m/ss
Explanation:F=ma a=F/M a=4,200/2,000= a=2.1 m/ss
It is imperative that the system-grounded conductors remain buried and is denoted as option D.
<h3>What is a Conductor?</h3>
This is referred as a substance which allows electricity and heat to flow through it and examples include metals.
These conductors have to be buried so as to prevent the risk of contact and electrocution of individuals thereby making it a safe method.
Read more about Conductor here brainly.com/question/492289
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Answer:
88.2J
Explanation:
Given parameters:
Mass of book = 3kg
Height of shelf = 3m
Unknown:
Potential energy = ?
Solution:
The potential energy of a body is the energy due to the position of that body.
It can be mathematically calculated as;
P.E = mgh
m is the mass of the body
g is the acceleration due to gravity = 9.8m/s²
h is the height
Now insert the parameters and solve;
P.E = 3 x 9.8 x 3 = 88.2J