b$)$ Figure below shows the torque$-$speed curve of a DC motor. Find the speed and motor current for the following conditions:

$,$ I

For the arm robot shown below, if link $1$ weight is about $80$ kg with length $70$ cm $,$ link $2$ has $50$ kg weight with $45$ cm length and gripper's weight is about $10$ kg $.$ Calculate the needed torque for the motor at joint $A,$ its speed and current. $[5$ points$]$

Fig$\mathrm{.}3\mathrm{.}1.$ Arm Robot