Question

on an object of mass 1 kg moving along x-axis with constant speed of 8 m/s, a constant force 2 N is applied in positive y-direction. Find its speed after 4 seconds

Answer 1

along x-direction...no change in speed...along y- direction force is applied....acceleration a long y- direction is 2 from laws v=u+at....along y- direction u=0...v=2×4=8.so speed along y direction is 8....along x is 8

Answer 2

here velocity of object is along x direction while force act on object is along y direction

we know that when direction of velocity perpendicular to force direction then object
do circular motion with constant speed
so velocity of object always constant