A ship travels 200 km north on the first day of its journey, 120 km northeast on the second day, and 240 km east on the third day. Find the resulting displacement and its direction. And the first thing we're going to do is establish the scale we're going to work with. For that, we look at the largest quantity that appears in the statement. In this case it is 240 km and we choose that our scale is 240 km equal to 8 cm. Now we will convert the other quantities to centimeters using this scale factor. And we start with 120 km. We already wrote 120 km / 1 and multiplied it by our conversion factor written as a fraction as follows. In the numerator we have 8 cm and in the denominator 240 km. And the kilometer units in the numerator cancel out the kilometer units in the denominator. And multiplying the fractions we have 120 * 8 cm = 960 cm. Between 1 * 240 is ig 240 and this division is equal to 4 cm. Therefore, we have that 120 km is equivalent to 4 cm. And when performing the conversion for the next quantity we find that 200 km is equal to 6.6,66 cm. As an observation, we only wrote the first four decimal places and now we are going to round it to one decimal place, that is, we are going to write 6.7 cm. Now we are going to draw each of these vectors on the Cartesian plane using the scale we chose and we start by drawing the first vector that the statement says, 200 km to the north and we measure 6.7 cm with the ruler and draw the vector. And here it is. Now, at the end of this vector we are going to draw the next one that says 120 km northeast. As an observation, the northeast direction is an angle of 45º between east and north. So, first we measure this 45º angle with the protractor. And here we have it, the 45º angle. And now we measure 4 cm with the ruler and draw the vector of magnitude 120 km. And here it is. And at the end of this vector we are going to draw the next one that says 240 km to the east and we measure with our ruler 8 cm and draw this vector of magnitude 240 km. And since we have drawn these three vectors given in the statement, finally we are going to draw the resultant vector, which goes from the origin to the end of the last vector. Now we will measure its magnitude with the ruler and observe that this vector measures 14.4 4 cm. Now we will convert this measured quantity into kilometers using our scale factor. To do this, we write 14.4 cm divided by 1 and we will multiply it by our conversion factor in fraction form. That is, in the numerator we write 240 km and in the denominator 8 cm. And the centimeter units in the numerator cancel out with the centimeter units in the denominator. And multiplying these fractions we get 3,456 km / 8 and this division is equal to 432 km. Therefore, 14.4 cm is equivalent to 432 km. Therefore, the magnitude of our resultant vector is equal to 432 km. And finally, we will measure the direction of this resultant vector. For that we use the protractor and observe that this angle measures 42º. So, to conclude, we have that the magnitude of the resulting displacement vector is equal to 432 km and with a direction of 42º with respect to the east. Well, friends, thanks for visiting. If you liked this video, subscribe and share it. More on this topic online.