01:Posttest 01:Motion Along a Straight Line 5. At the same moment, one rock is thrown upward at 4.5 m/s and another thrown downward at 3.4 m/s. What is the relative velocity of the first rock
from the perspective of the second rock? Assume that up is positive.
ration
0 -7.9 m/s
O 7.9 m/s
jects
O 1.1 m/s
0-1.1 m/s
Motion
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Description
12:00 AM
99

D

Explanation:

Given that one rock is thrown upward at 4.5 m/s and another thrown downward at 3.4 m/s. What is the relative velocity of the first rock

from the perspective of the second rock? Assume that up is positive.

Solution.

Since both of them are moving in the opposite direction, the relative velocity of the first rock from the perspective of the second rock will be

Relative velocity = 3.4 - 4.5

Relative velocity = - 1.1 m/s

Therefore, the relative velocity from the perspective of the second rock is negative 1.1 m/s.

The correct answer is option D.

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