A softball needs to hit a bucket 43.0 m away on flat ground. If it is aimed at 72.0°, what must its initial velocity be? (Unit = m/s)

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?

5g of ammonium nitrate was dissolved in 60g of water in an insulated container. the temperature at the start of the reaction was 23.0°c and at the end it was 19.0°c. calculate the energy absorbed by the reaction.

Which of the following is not a physical property of mattera. melting pointb.heat of combustionc. viscosityd. boiling point