# Homework Help: AS Physics Kinematics Question

1. Oct 18, 2011

### seiei

1. The problem statement, all variables and given/known data
All included in image provided. As you can see, it's a multi-choice qu

2. Relevant equations
Acceleration=Velocity/Time
Not sure what else...

3. The attempt at a solution
Uncertain about how to approach this question. Using SI units I eliminated B. Any help would be appreciated. Thanks :D
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

#### Attached Files:

• ###### kinematicsquestion.png
File size:
13.2 KB
Views:
103
2. Oct 18, 2011

### cepheid

Staff Emeritus
Are you aware of a kinematics equation (for constant acceleration) that relates distance travelled to acceleration and time?

3. Oct 18, 2011

### seiei

s=1/2at^2 when the initial velocity=0

4. Oct 18, 2011

### PeterO

Note that this is a multiple choice question.
You don't have to find the answer, you only have to find which one of these answers is the answer.

Your experience should tell you that an object falling on Earth [approximating g = 10] will fall to 5m in one second and to 20m in 2 seconds - an extra 15m.

This if a = 10, x = 5 and h = 15 then t1 = 1 and t2 = 2.

Substitute those values in and only one of the options will yield the correct answer.

I repeat - to emphasise:

This is a multiple choice question.
You don't have to find the answer, you only have to identify which one of the offered answers is the correct.

Alternately you can work with the equation you identified and derive the solution.