Answer:

Explanation:
Conceptual analysis
To solve this problem we apply Newton's second law:
The acceleration of an object is proportional to the force F acting on it and inversely proportional to its mass m.
a = F / m
Where,
F = m * a Formula (1)
F: Force in Newtons (N)
m: mass in kg
a: acceleration in m/(s^2)
a = v / t Formula (2)
v: speed in m/s
t: time in seconds (s)
Known information
We know the following data:
m = 1kg
v = 1 m/s
t = 1s
Development of the problem:
In the Formula (2): 
In the Formula (1): 
Answer:
Mechanical advantage=4
Explanation:
Load=1000N
Effort=250N
mechanical advantage=load/effort
Mechanical advantage=1000/250
Mechanical advantage=4
Answer:
<h2>
<em><u>Joules</u></em><em><u> </u></em><em><u>=</u></em><em><u> </u></em><em><u>Watts</u></em><em><u> </u></em><em><u>×</u></em><em><u> </u></em><em><u>Seconds</u></em></h2>
Explanation:
If you multiply the number of watts by the number of seconds, you'll end up with joules.