A spaceship moving with a velocity of 90m/s come to a complete stop in 18sec. And remains at rest for 12sec. Then it has traveled with a constant of 40m/s for 20sec A) velocity Vs time graph
B) displacement Vs time
C) calculate the total displacement for velocity- time graph

In a bumper car arena, two cars of equal mass are heading straight toward each other. the orange one is traveling at a speed of 5 meters per second. the green one is traveling at a speed of 2 meters per second. which of the forces most affects the motion of the bumper cars after they collide? a) gravity b) friction c) the other car d) wind resistance

The speed of light in a material is 0.50 c. what is the critical angle of a light ray at the interface between the material and a vacuum?

The crank oa rotates in the vertical plane with a constant clockwise angular velocity ω0 of 5.6 rad/s. for the position where oa is horizontal, calculate the force under the light roller b of the 10.6-kg slender bar ab.