Answer:
acceleration of the car is 3 m\s^2
Explanation:
from rest means the initial velocity (vi) is zero
time = 5s
final velocity (vf) = 15m\s
a = vf - vi \ t
a = (15-0) \ 5
a= 3 m\s^2
which means that the car is speeding up 3 meters every second
Answer:
B) 
Explanation:
The electric force between charges can be determined by;
F = 
Where: F is the force, k is the Coulomb's constant,
is the value of the first charge,
is the value of the second charge, r is the distance between the centers of the charges.
Let the original charge be represented by q, so that;
= 2q
= 
So that,
F = 
x 
= 2q x
x 
=
x 
=
x 
F =
x 
The electric force between the given charges would change by
.
Answer:
Part a)

Part b)

Part c)

Explanation:
Part a)
As we know that the gravitational force is given as

so we will have to find the ratio of force on two planets due to star
so here we have



Part b)
Orbital speed is given as

so the ratio of two orbital speed is given as


Part c)
Time period is given as

so the ratio of two time period is given as



Direction direction direction