Mechanics | Relativity Answers

a box of books weighing 235N moves at a constant velocity across the floor when the box it pushed with a force of 405N exerted downward at an angle of 35.2 degrees. how much momentum does the box posses?

A 60 kg mass and a 20 kg mass are separated by 10 m. At what point on a line joining these charges will another mass experience zero resultant force?

(take g= 10m s-2 in this question)
A ball moves in a vertical straight line under gravity.air resistance is negligible.the ball is projected from a point 2m above the ground with an upward speed of 3ms -1
A find the time taken for the ball to reach its greatest hight above the ground.
B show that this maximum hight above the ground is 2.45m.

If you’re on a bus driving at a certain speed, and you could somehow levitate, not touching the ground or the chairs, would you eventually move to the back of the bus or would you stay stationary?

a 1800kg car accelerates over a distance of 120meter due to a net force of 4200newton id its initial speed was 40km per hour what is its final speed?

One pound of coal, burned in a power plant, can produce 3,600,000 J of energy. How long could you power a 60 W light bulb on one pound of coal?

A 20 kg box is initially sliding across the floor at 10 m/s. If the force of friction on the box is 50 N, how far will the box slide before coming to a stop?

A 1200 kg car is traveling at 30 m/s. What is the kinetic energy of the car?

A roller coaster is traveling at 5 m/s at the top of a hill 40 m above the ground. What is the speed of the roller coaster when it is 15 m above the ground?

A ball is thrown straight up in the air at an initial speed of 30 m/s. Using conservation of energy, find the maximum height of the ball.