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We know that displacement is the same thing as average velocity times change in time (displacement=Vavg*(t1-t2)). Right now we have something in terms of time, distance, and average velocity but not in terms of initial velocity and acceleration. We know that average velocity is the same thing as initial velocity (vi) plus final velocity (vf ...
- 10 min
- Sal Khan
Velocity: It is the displacement of the body in unit time or rate of displacement. It is a vector quantity. Unit of velocity is c m s-1 in centimetre–gram–second system and m s-1 in meter-kilogram-second system of the unit. Acceleration: A particle moving with variable velocity is said to possess acceleration.
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Instantaneous velocity is the first derivative of displacement with respect to time. Speed and velocity are related in much the same way that distance and displacement are related. Speed is a scalar and velocity is a vector. Speed gets the symbol v (italic) and velocity gets the symbol v (boldface). Average values get a bar over the symbol.
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The first answer was correct, displacement does need a quantity and direction. Displacement can be calculated by measuring the final distance away from a point, and then subtracting the initial distance. Displacement is key when determining velocity (which is also a vector). Velocity = displacement/time whereas speed is distance/time.
- 5 min
- Sal Khan
To find the instantaneous velocity, when giving a position versus time graph, you look at the slope. Because it turns out the slope of a position versus time graph is the velocity in that direction. So since we had a horizontal position graph versus time, this slope is gonna give us the velocity in the ex direction.
- 15 min
- David SantoPietro
