Use the graph for both answers.

at what time would the magnitude of the velocity reach 36.00 km/hr?

a. 6.00 sec
b. 36.00 sec
c. 208.00 sec
d. it is always the same, traveling at 36.00 km/hr.



this graph depicts an object that has

a. positive acceleration
b. constant velocity
c. negative acceleration
d. no acceleration

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".