According to this equation, F=ma, how much force is needed to accelerate an 82-kg runner at 7.5m/s2?

A.

615 N

B.

10.9 N

C.

615 m/s

D.

10.9 m/s

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As a fire truck approached Mary, the pitch of the siren got higher. once the fire truck passed and moved away, the sirens pitch got lower. this change in pitch is because in the sound waves

Find the magnitude of the sum of these two vectors