What is the impulse for the entire 40 seconds

In order to calculate the impulse, you need to find out the area of the triangle, 
Area of triangle = 1/2 * b * h
Here, b = time = 40
h = force = 100

Substitute their values, 
A = 1/2 * 40 * 100
A = 1/2 * 400
A = 200 N.s

In short, Impulse and your answer would be 200 Newton-second

Hope this helps!

The question is:

Evaluate 6t−20−32u when t=6 and u=1/4

8

Step-by-step explanation:

The given expression is:

We need to evaluate the expression for the given values of t and u. Substituting t=6 and u=1/4 in the above expression we get:

Thus, the give expression is equal to 8 for t=6 and u=1/4