How can the acceleration not be negative if the brakes were slammed at a red light

If I have 3 apples and get another how many do I have

Is it possible for an object to have a negative acceleration and be speeding up? How/why?

I have to make a position-time graph for this question but I don't know how to. The question is:

You are riding your bicycle to school. On your way to school, you undergo the following motions

1. You accelerate from rest for 4.0s at +1.0m/s2

2. Then you coast (constant velocity) for 5.0s at +4.0m/s

3. then you slow down at -2.0m/s2 for 2.0s 

Its asking me to draw a pt, vt, and at graph. Then it's asking me to use my pt graph and calculate the max velocity reached by my bicycle. And to use the vt graph to calculate how far the bicycles traveled while braking. 

I just need a bit of clarification.

A north american river otter wants to cross the North Saskatchewan river. It can swim at a speed or 2.75m/s. In that location, the distance directly across the river is 45.0m and the current velocity is 2.5m/s. 

what does it mean when it says current velocity and in what direction is it going in

Im just a little confused with what to do next:

a river otter wants to cross a river. It can swim at a speed of 2.75m/s. the distance acorss the river is 45.0m and the current velocity is 2.5m/s. 

first it asked me to calculate the time taken, so I calculated the resultant (3.72m/s) and used that to calculate the time (12.1s). 

But now its asking me to calculate how many metres downstream the otter wil be when it gets to the other side, i dont know what to do for this? do i use the time i got previously and use the river current (2.5m/s) velocity???

then its also asking me to find the velocty relative to the bank where it started, didnt i already do that when I had calculate the resultant???

Please help Im so lost.

A little confused with this question: 

A swan is flying at a speed of 17.5m/s. A wind is blowing from the East at 12.5m/s. 

if the swan POINTED due South, what would be the magnitude and direction of the velocity relative to the ground. 

 if the swan WISHED to travel due south, what would be the velocity relative to the ground

I just want to know what the vector diagrams would look like for part a and b becasue im a little confused with that.

can someone help me with this question is really confusing and I don't understand, please.... I'm desperate

a ball along a straight path with the following velocity and time intervals:

-3.0s at 15.0m/s

-7.0s at 20.0m/s

-6.0s at -30.0m/s

-4.0s at 3.5m/s

a.total displacement?

b.displacement in the first 10s?

c.displcement in the last 10s?

d.displacement in the 5.0 - 15.0s time interval?

can you please show the procedure so I can understand how to do this equation. thank you

A jet weighs 3260kg and can withstand a max acceleration of "plus 7.33 g's". what is the net force acting on the jet? 

would I put g as (-9.81) or just (9.81)

can someone help me with this question is really confusing and I don't understand, I need it by Tuesday, please... I'm desperate

Calculate the average speed and the average velocity for a ball that is moved according to the following instructions.

the ball (x,y)i=(10.0,-5.0)m

the ball along any curved path somewhere near (x,y)f=(-20.0,-10.0)m.

a.the average speed calculations

b.the average velocity calculations 

c.why the average speed always greater than the magnitude of the average velocity?

can you please show the procedure so I can understand how to do this equation. thank you