Acceleration is the rate of change of velocity. When acceleration is zero, the rate of change of velocity is zero. That means the velocity is constant.
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b. lifting dumbbell weight at 20-degree angle from the body after a 45-degree angle
Answer on edg: what happens to the light coming from the sun? - scattering what happens to light on the surface of water? - specular reflection what happens to light on the surfaces of rocks? - diffuse reflection