B. Kilopascals.
A kilopascal equals to 1,000 pascals; and a pascal is equal to a force of 1 newton per square meter.
Meanwhile,
- a gram and a kilogram are both units of measurement for mass, and
- a newton is a unit of measurement for force.
A distance-versus-time graph for the moving object would curve upward for acceleration and curve downward for deceleration
The cliff is 12.71m tall.
Why?
Before solving the problem, we must remember that the phone was dropped, it means that there is no initial velocity, also, the acceleration acting on the phone is the acceleration due to gravity.
So, to find how tall is the cliff, we can use the following equations:


Now that we know the time, we can calculate how tall is the cliff:

Hence, we have that the cliff is 12.71m tall.
Have a nice day!
<u>Answer:</u>
average velocity =
<u>Explanation:</u>
We can find the average velocity using the following equation:
.
In this case:
• total distance travelled = 450 km
• time taken = 30 min = 0.5 h
Substituting these values into the equation:

⇒