Aracehorse is running with a speed of 20m/s along a straightway. what is the time it takes for the horse to cover 400m

The free body diagram shows a box being pulled to the left up a 25-degree incline. the magnitude of the normal force is

Very large accelerations can injure the body, especially if they last for a considerable length of time. one model used to gauge the likelihood of injury is the severity index ( ), defined as =/ . in the expression, is the duration of the accleration, but is not equal to the acceleration. rather, is a dimensionless constant that = the number of multiples of that the acceleration is equal to.in one set of studies of rear-end collisions, a person's velocity increases by 13.7 km/h with an acceleration of 36.0 m/s2 . let the + direction point in the direction the car is traveling. what is the severity index for the collision?

Because light travels in a straight line and casts a shadow, isaac newton hypothesized that light is