Worked example: Motion problems with derivatives | AP Calculus AB | Khan Academy

[@userdan-c2e]

If anyone having trouble with the relationship of speed with both velocity and acceleration here's what I know hope it helps velocity and acceleration have the same sign Both positive: This means the object is moving in the positive direction and its speed is increasing. Both negative: This means the object is moving in the negative direction and its speed is increasing (meaning it is moving faster in the negative direction). In both cases, the speed will be increasing. If velocity and acceleration have different signs Positive velocity and negative acceleration: This means the object is moving forward but slowing down. Negative velocity and positive acceleration: This means the object is moving backward but slowing down (in other words it is getting closer to stopping Reminder velocity is all about directions 😊

[@superscience8318]

Negative velocity and positive acceleration = slowing down

[@PrettyMuchPhysics]

Very nice example!

[@abcdefghijklmnopqrstuvwxyz9962]

Tysm for this vid man i needed this

[@ostanin_vadym]

Error, I think, at 3:52: If acceleration is negative, then speed can't increase, because negative accelaration is slowing down, accel > 0, then speed increase; if accel. = 0, then no speed change; if accel. < 0 speed is decreasing and sign of velocity doesn't matter. Am I wrong ?

[@jayravi131]

According to my high school textbook: Acceleration can be positive or negative, according to which direction it is in. If the acceleration is to the right, it is positive. If acceleration is to the left, it is negative. If the acceleration is in the same direction as the velocity, the particle is speeding up (accelerating). If the acceleration is in the opposite direction from the velocity, the particle is slowing down (decelerating). If the object is traveling at a constant velocity, there is no acceleration. i.e. a=0 So i think if u just remember velocity and acceleration as rates of change, it seems easier to understand

[@abcdefghijklmnopqrstuvwxyz9962]

Останин Вадим thanks so much for asking this question!! it was exactly what i needed to be answered, i thought the exact same thing

[@eihabarakzeh7171]

when accel and velocity are opposite signs the object is slowing down

[@ostanin_vadym]

@@eihabarakzeh7171 Probably I messed "velocity" and "speed"

[@Lglandorf6]

I was wondering the same thing.

[@SR71destroyed]

Nice video.

[@ramankumar2113]

Sir can you please tell me which software you use to teach Thanks in advance

[@moose_sauce2938]

sad that you never got to know :(

[@yonji7902]

Yeah