A 2 kg mass initially moving with a velocity vi = 3x + 2y m/s is acted upon by a force F = 4x - 10y N for 5 seconds. What is the velocity of the mass at the end of that time? (the anser in vector forn)

In outer space a rock of mass 5 kg is acted on by a constant net force (29, -15, 40) N during a 4 s time interval. At the end of this time interval the rock has a velocity of (114, 94, 112) m/s. What was the rock's velocity at the beginning of the time interval?

(a) Find the speed at which Superman (mass=90.0 kg) must fly into a train (mass = 17485 kg) traveling at 65.0 km/hr to stop it. Running into the train at that speed would severely damage both train and passengers. (b) Calculate the minimum time Superman must take to stop the train if the passengers experience an average horizontal force of 0.410 their own weight. (c) How far does the train then travel while being slowed to a stop?

A 115kg rugby player is initially running at 5.5 m/s in the + direction, but collides with a goalpost and experiences a backward force of 1.71 × 10^4 N for 5.25 × 10^-2 s. what is the final \velocity of the rugby player in the horizontal direction