If the position vector of the particle is given by r = 3t²^i+5+tj^+4k^ Find: (a). The velocity of the particle at t= 3 s

What produces a record of seismic waves? richter scale seismogram barometer seismograph

For general projectile motion, when the projectile is at the highest point of its trajectory, its acceleration is zero? a)the horizontal and vertical components of its velocity are zero. b) its velocity is perpendicular to the acceleration. c)the horizontal component of its velocity is zero. d)its velocity and acceleration are both zero.

You are given two vectors a⃗ =−3.00ι^ 5.00j^ and b⃗ =5.00ι^ 2.00j^. let the counterclockwise angles be positive.