**Answer:**

FORCE as for my answer....

The dependent variable in this experiment is how far the ball will roll.

the independent variable is the in incline.

**Answer:**

2.1 cm

**Explanation:**

The general equation for the graph is:

y = A cos(ωt + ∅)

A: amplitude, is the maximum and minimum value for y(t)

Answer:

Explanation: Here he is running with a uniform acceleration there for you can use motion equation for this

S = (V+U)×t / 2

S = Distance

V = Final velocity

U = Initial Velocity

t = time

50 = (V + 0.5 ) × 20 /2

V = 4.5 m/s

Answer:

Now using

K*q3q1/(1cm)² = kq3q2/(3.5cm)²

So

q1/1²= q2/3.5²

But q2= -3nC

So q1= (1/3.5)²* 3*10-9

q1= 0.24nC

q1 will be positive because to become the net force on the q3 charge due to the remaining two charges, the force due to each charge on the third force should be equal and opposite thus q1 is positive