A400 kg object is sitting at rest at the top of a hill that is 30.0m high and 80.0m long measured along the hill . if there is no friction ,how fast will the object be going at the bottom of the hill?

Identify the type of synthetic material used in each object

A2 kg ball travellng to the right with a speed of 4 m/s collidees with a 5 kg ball traveling to the left with a speed of 3 m/s. take right to be the positive direction. what is the total momentum of the two balls before they collide? what is the total momentum of the two balls after they collide?

Acar travels 40m in 8 seconds find the car speed