# Physics .can object have the same speed but different in velocity ? explain

Physics .can object have the same speed but different in velocity ? explain

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Yup. Two objects can move at 10 m/s but travel in opposite directions (right and left for example) with respect to the point or axis of reference. So the objects have the same speed but different velocities. Speed is a scalar but velocity is a vector. This is because the speed doesn't tell you in which direction the object is moving but the velocity tells you at what speed an object is moving and in which direction. So if your reference is the x-axis, the object moving at 10 m/s towards the right has a velocity of +10 m/s (or 10 m/s) and the one moving at 10 m/s towards the left has a velocity of -10 m/s.

• Anonymous
5 years ago

Suppose A is in a stationary rocketship and B is in a rocketship moving near the speed of light relative to A. First, the rate of passage of time is different for A and B. If A observes B, B will appear to be moving in slow motion; any clocks moving with B will appear to be running slow. This is called time dilation. Also distances will change. If A measures the length of B's rocket it while it is moving, the measured length will be less than the length measured by B. This is called length contraction. The formulae for calculating time dilation. and length contraction are called the Lorentz transformations. It is the Lorentz transformations that result in the effect you are talking about. Changes occur to space and time in such a way that each observer still measures the same value for the speed of light. If course from B's point of view, A is travelling near the speed of light. Exactly the same thing happens if we regard B as stationary and A moving. It may seem counterintuitive, but that's what nature does. We have a problem understanding it because our brains/thoughts have developed so they only deal with situations whee the Lorentz transformations have no measureable effects (because we don't experience travelling near the speed of light). A more detailed explanation needs some maths. E.g. see link.

• A good example is an object traveling in a circle at constant speed. The velocity is changing constantly even though the speed is constant.

Velocity is speed with a direction specified. Traveling in a circle, the direction is constantly changing, so the velocity is changing also.

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• Anonymous