Physics - Kinematics Question with Solution | TestHub

Two balls$A$and$B$are placed at the top of$180 \mathrm{m}$tall tower. Ball$A$is released from the top at$t=0 \mathrm{s}$. Ball$B$is thrown vertically down with an initial velocity$u$at$t=2 \mathrm{s}$. After a certain time, both balls meet$100 \mathrm{m}$above the ground. Find the value of$u$in$\mathrm{m} {\mathrm{s}}^{-1}$. [use$g=10{ \mathrm{m} \mathrm{s}}^{-2}$]