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## Homework Statement

A very small steel marble is shown rolling at a constant speed on a horizontal table. The marble leaves the table at M, falls, and hits the ground at P. This is illustrated in the diagram below which is drawn to scale. Calculate the time it took the marble to travel from L to P.

## Homework Equations

Professor Posted This

Still don't understand

p(t) = 0.5 * a * t^2 + v0 * t + p0

where

p(t) is position at time t

a is acceleration

v0 is initial velocity at time 0

p0 is position at time 0

## The Attempt at a Solution

Vertical acceleration due to gravity = -9.8 m/s^2 = -980 cm/s^2

px(t) = 100 = 0.5 * 0 * t^2 + v0 * t + 60 = v0 * t + 60

vertical

py(t) = 0 = 0.5 * -980 * t^2 + 0 * t + 40 = -490 * t^2 + 40

t=2.85s

v0 = 210.011

got an answer and online submition said it was wrong

Please help