In every case, you add the speed of the object (relative to the reference point) to the speed of the reference point (relative to the ground) to find the speed of the object relative to the ground. (We choose to use + to mean "up" or "forward".)
1. The speed of the 2nd balloon relative to the first is -12 m/s. The speed of the first relative to the ground is +8 m/s. Thus the speed of the 2nd balloon relative to the ground is
... (-12 m/s) + (+8 m/s) = -4 m/s . . . . 4 m/s, down
2. The speed of the Dodge relative to the ground is 70 mph. The speed of the BMW relatvie to the Dodge is -7 mph, so the speed of the BMW relative to the ground is
... (-7 mph) + (+70 mph) = 63 mph
3. The speed of the 2nd balloon relative to the first is -3 m/s. The speed of the first is +8 m/s relative to the ground, so the speed of the 2nd balloon relative to the ground is
... (-3 m/s) + (+8 m/s) = +5 m/s . . . . 5 m/s, up
4. The speed of the package relative to the helicopter is -9.5 m/s. The speed of the helicopter relative to the ground is -3.1 m/s, so the speed of the package relative to the ground is
... (-9.5 m/s) + (-3.1 m/s) = -12.6 m/s . . . . 12.6 m/s, down
Answer:
1.6
Step-by-step explanation:
Convince yourself that there are 3 similar triangles in the diagram. Choose the
similarity statement that represents the relationship among the 3 triangles.
do you have a picture to show so we can do the work an give out the answer thank you