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Dahasolnce [82]
3 years ago
12

Karen is running forward at a speed of 9 m/s. She tosses her sweaty headband backward at a speed of 20 m/s. The speed of the hea

dband, to the nearest whole number relative to a stationary observer watching Karen, is _____ m/s
Physics
2 answers:
Komok [63]3 years ago
8 0
Let Karen's forward speed be considered as positive.
Therefore, before the headband is tossed backward, the speed of the headband is
V = 9 m/s

The headband is tossed backward relative to Karen at a speed of 20 m/s. Therefore the speed of the headband relative to Karen is
U = -20 m/s

The absolute speed of the headband, relative to a stationary observer is
V - U
= 9 + (-20)
= - 11 m/s

Answer:
The stationary observes the headband traveling (in the opposite direction to Karen) at a speed of 11 m/s backward.

Advocard [28]3 years ago
7 0

Answer:

-11 m/s

Explanation:

a lot simpler than that above me

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Following are the key features of Pre operational stage

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