I need help with the question below: How can a still person have the same average speed vector, but a different average speed, as a person running on a circular track?

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Crowbar of 5 metre is used to lift an object of 800 metre if the effort arm is 200cm calculate the force applied

If a rock is thrown upward on the planet mars with a velocity of 12 m/s, its height (in meters) after t seconds is given by h = 12t − 1.86t2. (a) find the velocity of the rock after two seconds. m/s (b) find the velocity of the rock when t = a. 12−3.72a m/s (c) when will the rock hit the surface? (round your answer to one decimal place.) t = s (d) with what velocity will the rock hit the surface? m/s

Acoil suspended freely, points in some direction when no current is passed through it . can you tell what will happen when a current is passed though it?