Acceleration Problem 2

A plane stops from 300 m/s in 5 seconds. Calculate the plane's acceleration.

To find acceleration you need to know change of speed (ΔS).

What is ΔS for this equation?
1. ΔS = -300 m/s
2. ΔS = 300 m/s
3. ΔS = 305 m/s
4. ΔS = 5 m/s
A plane stops from 300 m/s in 5 seconds. Calculate the plane's acceleration.

Step 1: assign variables

Which of the following is correct?
1. a = ?
  ΔS= -300 m/s
  ΔT = 5 sec
2. a = 300 m/s
  ΔS= ?
  ΔT = 5 sec
3. a = 300 m/s
  ΔS= 5 sec
  ΔT = ?
4. a = ?
  ΔS= 5 sec
  ΔT = 300 m/s
A plane stops from 300 m/s in 5 seconds. Calculate the plane's acceleration.

Step 1: assign variables
a = ?
ΔS= -300 m/s
ΔT = 5 sec

Step 2: formula

What is the correct formula?
1. a = ΔS/ΔT
2. a = ΔT/ΔS
3. a = ΔSΔT
4. a/ΔS = ΔT
A plane stops from 300 m/s in 5 seconds. Calculate the plane's acceleration.

Step 1: assign variables
a = ?
ΔS= -300 m/s
ΔT = 5 sec

Step 2: formula
a = ΔS/ΔT

Step 3: put in numbers.

Which of the following is correct?
1. a = (300 m/s)(5 sec)
2. a = (-300 m/s)/(5 sec)
3. 300 m/s = ΔS/(5 sec)
4. a = (5 sec)/(300 m/s)
A plane stops from 300 m/s in 5 seconds. Calculate the plane's acceleration.

Step 1: assign variables
a = ?
ΔS= -300 m/s
ΔT = 5 sec

Step 2: formula
a = ΔS/ΔT

Step 3: put in numbers.
a = (-300 m/s)/(5 sec)

Step 4: calculate an answer
1. a = -60 m/s²
2. a = 60 m/s²
3. a = 1800 m/s²
4. a = 5/300 m/s²