A 3kg ball moving at 8m/s strikes a 2kg ball at rest. After the collision, the 3kg ball is moving with a velocity of 4m/s. What is the velocity of the 2kg ball after the collision?

What would the difference of spectral lines emitted by hydrogen gas in distant galaxies which is normally found at a wavelength of 21 cm on earth, be observed at 21.1 centimeters?

Aregular polygon has angkes of size 150° each.how many side has the polygon

Astudent pushes on a 20.0 kg box with a force of 50 n at an angle of 30° below the horizontal. the box accelerates at a rate of 0.5 m/s2 across a horizontal floor. what is the value of the normal force on the box? 200 n 243 n 156 n 225 n