Answer:
39.2m/s
Explanation:
Given parameters:
Mass of book = 5kg
Time taken for fall = 4s
Unknown:
Final velocity of the book = ?
Solution:
Serena dropped the book from rest therefore, the initial velocity of the book is 0.
Let us find the appropriate motion equation to solve this problem;
V = U + gt
V is the final velocity
U is the initial velocity
g is the acceleration due to gravity = 9.8m/s²
t is the time taken
Insert the given parameters and solve;
V = 0 + 9.8 x 4 = 39.2m/s
Answer:

Explanation:
The incident angle is
so the reflected ray will also be
.
The normal divides the angle between the incident and reflected ray. So, the angle between them would be

So, the angle between the incident and reflected rays is
.
At the same speed as the other ice cube
Answer:
meters per second squared
Explanation:
Because acceleration is equal to velocity over time where velocity is meters per second and time is measured in seconds making acceleration ms-2
Since <span>volume of each cube is 1 cm^3
Then we can get the </span>volume of 1 mole of cubes, which is

The edge

And the new adge that we are looking for:

=

So, the final soution for the edge length of cube is 844km.
Do hope it helps!
Regards.