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Masteriza [31]
4 years ago
14

A car starting from a standstill accelerates at a rate of 4 meters per second squared. how far, in kilometers, will the car trav

el in 20 seconds
A. 0.8km
B. 800km
C. 40km
D. 1,600km
Physics
1 answer:
ivanzaharov [21]4 years ago
6 0
D=(1/2) x at^2. d=(1/2)(4)(20)^2. 2(400)=800 m. In kilometers, the answer is 0.8 km. A. You're welcome. ;)
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There are two ways to solve this. The longer way is to use those equations to calculate numbers for total distance.

The easier way is to find the area under the graph. That's right, AREA UNDER VELOCITY-TIME graph is the TOTAL DISTANCE travelled!

it's a shortcut.

Let's split up the area into a triangle and rectangle:

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Rectangle = (6-4)(10-0) = 20 m

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