Consider the following U$($x$)$ graph.

An object of mass $2\mathrm{.}96$ kg is released at $x=21m$ with a velocity to the left of $2\mathrm{.}85\frac{m}{s}.$

A$.$ What is $U_{21}$ for this object?

$4\mathrm{.}0$

B$.$ What is $K_{21}$ for this object?

$4\mathrm{.}9$

$$

C$.$ Where will the object stop moving briefly?

$4\mathrm{.}9$

Another object of mass $2\mathrm{.}84$ kg is released at $x=21m$ with a velocity to the left of $4\mathrm{.}11\frac{m}{s}.$

D$.$ What is $U_{21}$ for this object?

$4\mathrm{.}0$

E$.$ What is $K_{21}$ for this object?

$4\mathrm{.}9$

F$.$ What is this object's velocity at $x=7m?4\mathrm{.}0$