Answer:
+3 due to presence of proton
Answer: Height of building = 17.69m, velocity of brick = 18.6m/s
Explanation: From the question, the body has a zero initial speed, thus initial velocity (u) all through the motion is zero.
By ignoring air resistance makes it a free fall motion thus making it to accelerate constantly with a value of
.
Time taken to fall = 1.90s
a)
thus the height of the building is calculated using the formulae below

but u = 0 , hence


b)
to get the value of velocity (v) as the brick hits the ground, we use the formulae below

but u= 0, hence


find the attachment in this answer for the accleration- time graph, velocity- time graph and distance time graph
Answer:
Because of heavy mass
Explanation:
When force acts on a body it tends to accelerate the body. The acceleration produced in the body depends on two things:
1). Magnitude of force
2). Mass of the body
F= ma
⇒ a = F/m
As the force exerted on earth and another object are the equal in magnitude but opposite in direction. This forces will accelerate the object toward the earth but can't accelerate the earth as earth has very high mass.
a = F/m
This force tends to accelerate the earth but but due to earth's inertia the earth does not accelerate.
Answer is D - from the equation of electric field for point charge
Answer:
0.004 m away from the film
Explanation:
u = Object distance
v = Image distance
f = Focal length = 50 mm

The image distance is 0.051 m
When u = 50 cm

The image distance is 0.055 m
The lens has moved 0.055-0.051 = 0.004 m away from the film