A tennis ball's initial velocity is 30m/s [S]. When struck by a tennis racquet, its velocity becomes 28m/s [n30w]. Determine the ball's change in velocity.
P.S. i tried several times but i dont know how the diagram for this question will look like. Can someone plz help and diagram wud be useful.
2007-09-30 13:51:17 · 1 answers · asked by cool :-D 1 in Science & Mathematics ➔ Physics
Can't provide diagram. Basically you have two vectors given in polar coordinates (magnitude, angle). You have to convert these to rectangular coordinates. First adjust the angle to radians counterclockwise from the +x axis. Then multiply the magnitude by cos(theta), sin(theta) to get vx, vy. Then subtract the initial velocity vector from the final velocity vector. This is the velocity change. If the answer is expected in polar coordinates, convert back to polar. Angle = arctan(vy/vx), magnitude = sqrt(vx^2+vy^2).
2007-10-01 04:32:55 · answer #1 · answered by kirchwey 7 · 0⤊ 0⤋