A body is projected such that its position vector varies with time as

PHYSICS · Subjective · AP · Physics 1: Algebra-based · Kinematics · Kinematics

Problem

\mathbf{r}=\left(3t\hat{\mathbf{i}}+(4t-5t^2)\hat{\mathbf{j}}\right)\ \text{m}

, where

t

is in seconds. Find the time and the

x

-coordinate of the particle when its

y

-coordinate is zero.