Answer:
a. Two bodies are rubbed against each other they acquire equal and Opposite charge.
b. Electron are transferred from one object to another when two objects are charged by friction.
c. Lightening rod is a device used to secure tall buildings from the effect of lightning
d. Negative charge is obtained by plastic comb when rubbed with dry hair.
e. Lightning is natural spark discharge on huge scale.
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If the mass and post-collision speed of block 1 is known, the momentum of the block 2 can be determined.
<h3>
What is momentum?</h3>
The momentum of an object in motion is the product of mass and speed of the object.
P = mv
<h3>Conservation of linear momentum</h3>
The principle of conservation of linear momentum states that, the sum of the initial momentum must be equal to the sum of the final momentum.

Thus, if the mass and post-collision speed of block 1 is known, the momentum of the block 2 can be determined.
Learn more about conservation of linear momentum here: brainly.com/question/7538238
Answer:
The height of the platform is 22.686 m.
Explanation:
Given;
initial velocity of Janet, u = 2.63 m/s
time of her motion, t = 1.9 s
The height of the platform is given by;
h = ut + ¹/₂gt²
substitute the given values and solve for height "h"
h = (2.63 x 1.9) + ¹/₂(9.8)(1.9)²
h = 4.997 + 17.689
h = 22.686 m
Therefore, the height of the platform is 22.686 m.
Answer:
No, the truck will not cross the barrier.
The closeness of the truck to the barrier is of 21.875 m
Solution:
As per the question:
Velocity of the truck, v = 25.0 m/s
Acceleration of the truck, a = - 4 
Now,
Since, the barrier at a distance of 100 m. Thus in order to check whether the truck hit the barrier or not, we will see the distance, d it covers by using the kinematic eqn:

Final velocity, v' = 0 m/s
Initial velocity = v
Now,


d = 78.125 m
Thus the truck will not cross the barrier.
Distance between the barrier and the truck:
100 - 78.125 = 21.875 m