Given:
v(final velocity)= 7.5 m/s
t(time taken to pedal along)=4.5 s
Displacement (s)=19 m
Now we know that
s=ut+1/2(at^2)
Where s is the displacement measured in m
u is the initial velocity measured in m/sec
a is the acceleration measured in m/s^2.
t is the time taken to cover this distance.
Substituting the given values in the above formula we get
19= 4.5u+1/2(a x 4.5 x 4.5)
20.25 a + 9 u = 38
Now we also know that
v= u + at
Substituting the given values in the above formula we get
7.5= u + 4.5a
Solving for u and a from the above equations we get
u = 0.944m/s
a= 1.45 m/s^2
Thus the initial velocity is 0.944 m/s
The law of inertia pertains to both objects at rest and objects travelling in uniform motion (constant rate of motion so acceleration = 0).
ie of an object at rest: A person pushes a building with as much force as possible. The building is at rest and doesn’t move due to its inertia.
ie of an object travelling in uniform motion: An apple is thrown out of a car window. The apple bounces and moves on the ground after it is thrown out the window because of its inertia.
Hope this helps! :)
The major process would be glacial flow
Displacement is equals to final position minus initial position so final position is 45.6 m and initial position is 0.2 m so 45.6 - .2= 45.4
Take the radius of the Earth 6 370 km.Then:
The semimajor axis:a = 6 370 + 360 = 6 730 km
Semiminor axis:b = 6 370 + 180 = 6 550 km
Eccentricity:ε = √ (a2+b2) / a = √ (6 7302+65502) / 6 730 ≈ 1.4