Question

can anyone plz find this this is a question based on center of mass (COM).from the chapter rotation of particles.

Answer 1

Components of velocity about the horizontal cancel each other.

Acc of COM in X direction= 0
Vel of COM in X direction= 0
there will be no change in x coordinate of COM.

AccCOM in y direction= G

VelCOM in y direction= 10sin30 or 5m/s

s=ut+1/2at^2

here s is y coordinate of COM.

Y=5t-1/2gt^2
at t=20s

Y=50-500
=-450

As there is a surface the projectiles will stop and lie on the floor,

Co-ordinates of COM are (0,0)