A tractor, starting from a stationary position, drives down the road. It accelerates at 4 m/s2 for 10 seconds, then travels at a steady pace for another 30 seconds. How much distance has it covered since it started driving?

B. 1400 meters.

Step-by-step explanation:

According to the statement, there are two stages for the motion of the tractor, in which we need to find the travelled distance:

(i) Uniform accelerated motion.

(1)

(2)

Where:

- Initial position of the tractor, measured in meters.

- Final position of the tractor, measured in meters.

- Initial velocity of the tractor, measured in meters per second.

- Time, measured in seconds.

- Acceleration, measured in meters per square second.

- Final velocity of the tractor, measured in meters per second.

(ii) Uniform motion.

(3)

Where:

- Final position of the tractor, measured in meters.

- Time, measured in seconds.

The distance covered by the tractor (), measured in meters, is:

(4)

If we know that , , , and , then distance covered by the tractor is:

By (1) and (2):

By (3):

By (4):

The correct answer is B.

each side has a different length.  

step-by-step explanation:

the answer is ! ?