pls help with my with my homework, i started it but i’m stuck on the rest. if my answers that i already put are wrong pls let me know

You are 100% right for question a and you have a good start on b!

Explanation:

For (ii) of part a, you could also say that since the friction force is in the opposite direction of the pushing force, that the friction is '-60N' The negative sign just shows the direction of friction relative to the pushing force. But for the magnitude the signs are not important.

For part b,

work done equals force × distance

w = F×d

In this case, the worker is pushing with 60 newtons, and the distance is 28m.

Therefore,

w = 60N×28m

w = 1680j

(Or 1.7kj)

Great job! You got most of it!

answer; equivalent to a one(1) horsepower motor;

float.

archimedes' principle

denser than water sinks in water.

denser than mercury would sink in it