Which statement correctly differentiates speed and velocity and identifies which describes energy transfer rate?

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Multiple Choice

Which statement correctly differentiates speed and velocity and identifies which describes energy transfer rate?

Speed tells how fast something is moving and has only magnitude (a scalar). Velocity tells how fast and in what direction, so it’s a vector. The rate at which energy is transferred is power, defined as work done per unit time. So the description that matches all three ideas is: speed is the magnitude of how fast an object moves; velocity includes direction; energy transfer rate is described by power. For example, a car moving north at 20 m/s has speed 20 m/s and velocity 20 m/s north. If it travels at the same speed but changes direction, its velocity changes while its speed may stay the same. Power is not energy itself but the rate at which energy is transferred.

Speed tells how fast something is moving and has only magnitude (a scalar). Velocity tells how fast and in what direction, so it’s a vector. The rate at which energy is transferred is power, defined as work done per unit time. So the description that matches all three ideas is: speed is the magnitude of how fast an object moves; velocity includes direction; energy transfer rate is described by power. For example, a car moving north at 20 m/s has speed 20 m/s and velocity 20 m/s north. If it travels at the same speed but changes direction, its velocity changes while its speed may stay the same. Power is not energy itself but the rate at which energy is transferred.

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