Un pitcher lanza una bola rapida horizontalmente con una rapidez de 140 km/h hacia home, que esta a 18.4m de distancia. si los timepo combinados suman 0.350 s, ¿durante cuanto tiempo puede mirar el bateador la bola despues de que sale de la mano del lanzador, antes de hacer el swing? en su recorrido hacia home,¿ que tanto baja la pelota respecto a su linea horizontal original?

Aparticle's position is given by x = 3.00 - 9.00t + 3t2, in which x is in meters and t is in seconds. (a) what is its velocity at t = 1 s? (b) is it moving in the positive or negative direction of x just then? (c) what is its speed just then? (d) is the speed increasing or decreasing just then? (try answering the next two questions without further calculation.) (e) is there ever an instant when the velocity is zero? if so, give the time t; if not, answer "0". (f) is there a time after t = 3 s when the particle is moving in the negative direction of x? if so, give the time t; if not, answer "0".