8. Una fuerza de 100 N actúa sobre un cuerpo que se desplaza a lo largo de
un plano horizontal en la misma dirección del movimiento. Si el cuerpo se
desplaza 20 m. (Recuerda que si es en un plano horizontal el ángulo es cero)
¿Cuál es el trabajo realizado por dicha fuerza?

Imagine that someone pushes one marble toward a motionless marble. would there still be action-reaction forces involved in the collision? how might the marbles’ motions be changed? ?

Acar traveling at 22 m/s starts to decelerate steadily. it comes to a complete stop in 15 seconds. what is it’s acceleration?

(a) assume the equation x = at^3 + bt describes the motion of a particular object, with x having the dimension of length and t having the dimension of time. determine the dimensions of the constants a and b. (use the following as necessary: l and t, where l is the unit of length and t is the unit of time.) (b) determine the dimensions of the derivative dx/dt = 3at^2 + b. (use the following as necessary: l and t, where l is the unit of length and t is the unit of time.)