The position vector of a particle $\vec{R }$ as a function of time $t$ is given by:
$\vec{{R}}=4 \sin (2 \pi {t}) \hat{i}+4 \cos (2 \pi {t}) \hat{j},$
where $R$ is in metres, $t$ is in seconds and ${\hat{i},\hat{j}}$ denotes unit vectors along ${x}$ and ${y}\text-$directions, respectively. Which one of the following statements is wrong for the motion of the particle?

1.	Acceleration is along $(\text{-}\vec R )$.
2.	Magnitude of the acceleration vector is $\frac{v^2}{R}$, where $v$ is the velocity of the particle.
3.	Magnitude of the velocity of the particle is $8$ m/s.
4.	Path of the particle is a circle of radius $4$ m.

The velocity of a projectile at the initial point $A$ is $2\hat i+3\hat j~\text{m/s}.$ Its velocity (in m/s) at the point $B$ is:
              

A particle moves in a circle of radius $5$ cm with constant speed and time period $0.2\pi$ s. The acceleration of the particle is:

A missile is fired for a maximum range with an initial velocity of $20~\text {m/s}.$ If $g=10~\text{m/s}^2,$ then the range of the missile will be:

A particle of mass m is projected with velocity v making an angle of 45° with the horizontal. When the particle lands on level ground, the magnitude of change in its momentum will be:

1.  $2\mathrm{mv}$

2.  $\mathrm{mv}/\sqrt{2}$

3.  $\mathrm{mv}\sqrt{2}$

4.  zero

A particle starting from the origin $(0,0)$ moves in a straight line in the $(x,y)$ plane. Its coordinates at a later time are ($\sqrt{3}$, $3).$ The path of the particle makes an angle of __________ with the $x$-axis:
1. $30^\circ$
2. $45^\circ$
3. $60^\circ$
4. $0$

For a projectile projected at angles $(45^{\circ}-\theta)$ and $(45^{\circ}+\theta)$, the horizontal ranges described by the projectile are in the ratio of:
1. $1:1$
2. $2:3$
3. $1:2$
4. $2:1$

A car turns at a constant speed on a circular track of radius $100~\text m,$ taking $62.8~\text s$ for every circular lap. The average velocity and average speed for each circular lap, respectively, is:

The speed of a swimmer in still water is $20~\text{m/s}.$ The speed of river water is $10~\text{m/s}$ and is flowing due east. If he is standing on the south bank and wishes to cross the river along the shortest path, the angle at which he should make his strokes with respect to the north is given by: