$A$ particle is moving in a circular path of radius $r$. The displacement after half a circle would be:

If the acceleration of a particle is constant in magnitude but not in direction,what type of path is followed by the particle?

Give an expression for the speed of an athlete if he takes time $t$ to complete one round of a circular track of radius $r$.

An artificial satellite is moving in a circular orbit of radius nearly $42,250 \, km$. Calculate its linear velocity, if it takes $24 \, \text{hours}$ to revolve around the Earth. (in $ km/s$)

$A$ boy is whirling a stone tied with a string in a horizontal circular path. If the string breaks,the stone

An athlete completes one round of a circular track of diameter $49 \,m$ in $20 \,s$. Calculate the distance covered and displacement at the end of $30 \,s$.