Got the first part of 7, thanks. Don't understand when they ask to "State the conditions that must be satisfied for the equation to be valid." though :/
For 11, what I've done so far is
v = u + at
10 = 50 + 9.81(t)
-40 = 9.81(t)
t = -4.0s
It's a negative number, I guess I'm supposed to flip it...
Question 7
a) Acceleration is the rate of change of velocity
Use your definition in (a) to show that v = u + at, where v is the final velocity, u is the initial velocity and a and t are the acceleration and the time interval respectively.
State the conditions that must be satisfied for...