(Still part of the question)
Why is its actual speed usually different from its average speed?
2007-09-07 23:46:51 · 7 answers · asked by Candy62 1 in Science & Mathematics ➔ Physics
Average speed = Distance / time = 400 / 20 = 20 m/s
Actual speed may or may not be equal to the average speed since the car may be accelerating, decelerating, may be changing speed both ways (braking and then accelerating) etc.
2007-09-07 23:52:25 · answer #1 · answered by Swamy 7 · 2⤊ 0⤋
Average velocity = total dist./total time
Av. Velocity = 400m/20 sec.= 20m/sec
In a journey, the car need not travel 20 m. in every second. If it is so it is called UNIFORM VELOCITY. The car travels equal distances in equal intervals of time. But practically the car can not .While travelling, the driver will have to apply brakes, sometimes accelerate , sometime slows down. So the car can not stick to average velocity.
2007-09-08 06:12:42 · answer #2 · answered by Joymash 6 · 0⤊ 0⤋
Divide 400 by 20 and you get 20 so the average speed should be 20 meter every second. because it travels 400 meters in 20 seconds then average speed in every second is 20 meters.
2007-09-08 00:30:07 · answer #3 · answered by manny 2 · 0⤊ 0⤋
Speed = Distance/Time
Speed = 200/40
Speed = 20
The average speed is 20 m/s
2007-09-08 01:56:41 · answer #4 · answered by Anonymous · 1⤊ 0⤋
S = D/T
S = 200/40
S = 20
The average speed is 20 m/s
2007-09-07 23:56:27 · answer #5 · answered by Garima G 2 · 1⤊ 0⤋
20m/s; its actual speed varies cuz it could be going faster or slower in those 20 seconds. the average is the total distance divided by the speed
2007-09-07 23:54:19 · answer #6 · answered by mm81084 2 · 0⤊ 0⤋
If it is stoped than it must accelerate and eventualy surpass the average speed of 440m/20s.
2007-09-07 23:57:31 · answer #7 · answered by Squirrel E. S 1 · 0⤊ 0⤋