An object moves from point A to B to C to D and finally to A along the circle shown in the figure below.
a) Find the distance covered by the moving object.
b) Find the magnitude of the displacement of the object

here's the solution,

The radius of the circle = 3 km

distance covered = circumference of the circle,

So, Circumference :

=》

=》

=》

(a). Distance covered by moving object is 18.84 km

(b). 0 km

now, Displacement of the object is 0 km, because displacement is the shortest distance from stating point to the destination, but the object returns back to the starting point, hence magnitude of displacement is 0.

massxgravity x heght=weightxheight= pe

4900=490xh

h=10