A 70-kg sprinter pushes on the starting blocks for 0.20 s and leaves them with a speed of 5.0 m/s. He then continues
to accelerate for a further 5.0 s until his speed is 12 m/s. Find
the reaction force exerted by the starting blocks on the sprinter
and his average power output in each of the accelerations.

An object starts from rest at point f and speeds up continuously as it moves around an oval. a. choose a point about 1/8 th of the way around the oval from point f, and label it point g. draw a vector to represent the velocity of the object at point g. b. determine the change in velocity vector   between points f and g.

Velocity is a description of both speed and direction, therefore it - a vector - a force arrow - the same as acceleration - a magnitude

Debbie places two shopping carts in a cart corral she pushes the first cart which then pushes a second cart what force is being exerted