A heavy body rolls down a slope without initial velocity and without considering friction, and thus covers a distance of $98.6 \mathrm{~m}$ in 5 seconds. What is the angle of inclination of the slope: $[1]$[^0]


[^0]:    ${ }^{1}$ The acceleration due to free fall: $g=980.8 \frac{\mathrm{cm}}{\mathrm{sec}^{2}}$ (according to Gruber's determination, in Budapest $g=980.837 \frac{\mathrm{cm}}{\sec ^{2}}$ ).
$$
\sin \alpha=\frac{2 s}{g t^{2}} ; \quad \text { from this } \quad \alpha=53^{\circ} 32^{\prime} .
$$