A crate of mass $50kg$ slides down a chute which is raised at $15$ to the horizontal. Its initial velocity is $4$

$\frac{m}{s}.$ Calculate its velocity as it exits the chute, if the chute is $10m$ long. The coefficient of dynamic friction

is ${}_k=0\mathrm{.}3.$

$[3\mathrm{.}15$ m$/$s$]$