At time t = 0, a 2150-kg rocket in outer space fires an engine that exerts an increasing force on it in the +x-direction. this force obeys the equation f = at^2, where t is time,
and has a magnitude of 781.25 n when r = 1.25 s. (a) find the si value of the constant a, including its units. (b) what impulse does the engine exert on the rocket during the i .50-s
interval starting 2.00 s after the engine is fired? (c) by how much does the rocket? s velocity change during this interval?

What is the acceleration of a spaceship that is initially at rest and then speeds up to 220 m/s in 20 seconds

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?

Sort the images based on whether there's a force of attraction or repulsion between the magnets shown. attraction repulsion