1. the position of an object moving in a straight line is given as x=5-25t-4t^2-1.5t^3, where x is in meters and t in seconds. (a)what is the

1. the position of an object moving in a straight line is given as x=5-25t-4t^2-1.5t^3, where x is in meters and t in seconds.(a)what is the position of the object at t=1,2,3 and 4s?(b)what is the object's displacement between t=0 and t=4s?(c)what is the average velocity for the time interval from t=2 to t=4s?what is the instantaneous velocity at t=1,2,3 and 4s?2. a ball is thrown horizontally with a velocity of 12m/s. (a)how far has the ball fall 1sec later, (b). 2sec latersince action and reaction forces are always equal in magnitude and opposite in direction, how can anything ever be accelerated?3. what force must be applied to 5kg object to move it downward with acceleration 1m/s^2? what is the direction of the applied force.how much force is needed to decreases the velocity of a 5000kg truck from 40 km/h in 10s? how far does the truck travel in this time? what is the change of kinetic energy of the truck?a 1000kg car traveling 20m/s collides with a 100kg car traveling at 8m/s. (a) if the two cars stick together, what is their final velocity? (b)how much kinetic energy is lost? what persentage of the original kinetic energy is this?