A4 kg object attached to a horizontal string moves with constant speed in a circle on a frictionless horizontal surface. the kinetic energy of the object is 72 j and the tension in the string is 426 n. find the radius of the circle. answer in units of m

Aparticle initially located at the origin has an acceleration of = 2.00ĵ m/s2 and an initial velocity of i = 8.00î m/s. find (a) the vector position of the particle at any time t (where t is measured in seconds), (b) the velocity of the particle at any time t, (c) the position of the particle at t = 7.00 s, and (d) the speed of the particle at t = 7.00