2.2 acceleration
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Transcript of 2.2 acceleration
Acceleration is the change of VELOCITY with time
𝑎 =∆𝑣
𝑡=
(𝑣−𝑢)
𝑡
Here:v = final velocity (at the end)
u= initial velocity (at the start)t = time taken
If Road Runner starts running and reaches a speed of 400m/s in 10 seconds, what was his acceleration?
𝑎 =(400−0)
10=
(400)
10= 40𝑚/𝑠2
This dragster reaches a top speed of 150m/s in 3.7 seconds. What was it’s acceleration?
𝑎 =(150−0)
3.7=
(150)
3.7= 40.5𝑚/𝑠2
Since the dragster is travelling at 150m/s, what will the speedo show in km/h? Convert this number to km/h.
Since the dragster is travelling at 150m/s, what will the speedo show in km/h? Convert this number to km/h.
Convert the mtres to kilometres (it must go down, so divide)
150/1000 = 0.15km/s
Now convert the hours to seconds (it must go up, so multiply)
0.15 * 60 * 60 = 540km/h
The driver pops his parachute at 150m/s. It slows him down to 40m/s in 1.25 seconds. What was his acceleration?