Answer:
<h3>The answer is 500 kg</h3>
Explanation:
The mass of the object can be found by using the formula

v is the velocity
KE is the kinetic energy
From the question we have

We have the final answer as
<h3>500 kg</h3>
Hope this helps you
The meaning of inference is the process of inferring something and it is a noun
The answers are:
a) 
b) 
Why?
It seems that you forgot to write the questions of the problem, however, in order to help you, I will try to complete it.
The questions are:
a) How much work does the heart do in a day?
b) What is its power output in watts?
So, solving we have:
We need to convert from liter to cubic meters in order to use the given information, so:

Also, we need to find the mass given the density of the blood.

Now, calculating how much work does the heart do in a day, we have:

Then, calculating what is the power output and its horsepower, we have:

Have a nice day!
I think the answer is A
.
im not the best with physics but i think its right