If a big day covers 1 round around a circular park and returns back to its initial point wat will it's velocity be give reason

Calculate the mass of an object that has a momentum of 100kg x m/sec and velocity of 4 m/sec

The frequencies refer to the sample data collected from a population of interest when performing a hypothesis test comparing two or more population proportions.

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".