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[مرام12]

The speed of a particle moves with an instaneous velocity v=-25
الجواب طلع S=25 m/s

كيف طلع الجواب؟ يعني دايما تكون الاشاره عكس ؟

A particle moves in the positive x-direction with increasing speed
A) its velocity is -ve and acceleration is +ve
B) its velocity is +ve and acceleration is zero
C) its velocity is +ve and acceleration is -ve
D) its velocity and acceleration are both +ve

الجواب d طيب على أي أساس قلت d ؟