If the position vector of the particle is given by r=3t^2+5tj^2+4k Find: (a). The velocity of the particle at t = 3 s (b). Speed of the particle
at t = 3 s (C). acceleration of the particle at time t = 3 s​

When an object moves in uniform circular motion, the direction of its acceleration is a) in the same direction as its velocity vector. b) in the opposite direction of its velocity vector c) is directed toward the center of its circular path. d) is directed away from the center of its circular path. e) depends on the speed of the object.

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

When considering gravity acceleration and the force of acceleration, what must be true? a. the direction of acceleration must be perpendicular to the direction of the force. b. the direction of the force and the direction of acceleration must be the same as each other. c. the direction of the force and the direction of acceleration must be opposite of each other. d. the mass of the body must be the same as the acceleration of the body.