Answer:
positive direction with a changing velocity. An object which moves in the positive direction has a positive velocity. If the object is slowing down then its acceleration vector is directed in the opposite direction as its motion (in this case, a negative acceleration
Answer:

Explanation:
Spring constant is given as:

But F is mass times velocity(gravitational acceleration
=
83N/m=


Therefore the ruler reading will be
. Hence the ruler reading is 0.4451m
Answer:
Work
Explanation:
The use of force to move an object is the definition of "work" in physics.
Answer:
a

b
i 
ii 
iii 
Explanation:
Generally the time taken to travel 1 m in a vacuum is mathematically represented as

Here c is the speed of light with value 
So



The distance light travels in water is mathematically represented as

Here n_w is the refractive index of water with value 1.333
So


The distance light travels in glass is mathematically represented as

Here n_g is the refractive index of glass with value 1.5
So


The distance light travels in cubic zirconia is mathematically represented as

Here n_c is the refractive index of cubic zirconia with value 2.15
So


Answer:
16.1
Explanation:
165 = 4 + ( 10 ) T
165 = 4 + 10T
Subtract 4 on both sides,
165 - 4 = 10T
161 = 10T
10T = 161
Divide 10 on both sides,
T = 161 / 10
T = 16.1