Physics

Problem

20\,\text{kg}

crate is pushed up a straight ramp that makes a

30^{\circ}

angle with the horizontal. The coefficient of kinetic friction between the crate and ramp is

0.20

. The crate is pushed a distance of

2.0\,\text{m}

along the ramp, speeding up from

1.0\,\text{m/s}

2.0\,\text{m/s}

. What is the magnitude of the constant force applied parallel to the ramp? a)

210\,\text{N}

98\,\text{N}

150\,\text{N}

110\,\text{N}