Answer:
14 m/s
Explanation:
The motion of the book is a free fall motion, so it is an uniformly accelerated motion with constant acceleration g=9.8 m/s^2 towards the ground. Therefore we can find the final velocity by using the equation:
where
u = 0 is the initial speed
g = 9.8 m/s^2 is the acceleration
d = 10.0 m is the distance covered by the book
Substituting data, we find
Action and reaction are equal and opposite (Newton’s 3rd Law) so a deadly force must create a deadly reaction.
matter is a solid liquid or gas , a atom is a basic unit of a chemical element and a molecule is a group of atoms together
<u>Answers</u>
Question 1
After adding the two numbers together, you will find a number. To determine the number of significant figures, count the digits from right to left. The zeros on the left end and the right end are not significant. The zeros between the non-zero digits are significant.
Question 2
A mete stick is shorter than the student. So by using it, she will be force to take the measurements twice then add then together to get her height. This increases the chances of making errors. To improve the accuracy she should change the measuring instrument and use a tape measure. This will allow her to make only one measurement.
Question 3
Volume = length × width × height
= 105 × 75 × 80.5
= 633,937.5 cm³
In scientific notation;
633,937.5 cm³ = 6.339375 × 10⁵ cm³
<u>Explanation</u>:
Consider the given function
Given that the velocity of rocket is increases at the rate of
The mass of rocket is decreasing at rate of .
Hence
Now find the rate of change of kinetic energy when and
Now consider the given equation,
Now substituting the values and
The rate at which kinetic energy changing is 25MJ