A3.4 kg block with a speed of 5.7 m/s collides with a 6.8 kg block that has a speed of 3.8 m/s in the same direction. after the collision, the 6.8 kg block is observed to be traveling in the original direction with a speed of 4.8 m/s. (a) what is the velocity of the 3.4 kg block immediately after the collision? (b) by how much does the total kinetic energy of the system of two blocks change because of the collision? (c) suppose, instead, that the 6.8 kg block ends up with a speed of 7.6 m/s. what then is the change in the total kinetic energy?

Which best describes how fluids change as they travel through different portions of the convection currents? they change to solids at the outer portion of the convection currents. they change to solids at the inner portion of the convection currents. they become more dense at the outer portion of the convection currents. they become more dense at the inner portion of the convection currents

A250-n box is at rest on a frictionless horizotal floor. then a person shoves the box with a non-zero force of magnitude p. which statement best describes the relationship betweeen p and the motion of the box after it was shoved? -the box will not move when p< 250n but otherwise will accelerate at a constant rate that is directly proportional to p - the box will begin moving at a speed that is directly proportional to p, then will gradually slow to a halt -the box will move with constant velocity at a speed that is directly proportional to p -box will accelerate across the floor at a constant rate that is directly proportional to p

Charge is distributed along the entire x-axis with uniform density λ. how much work does the electric field of this charge distribution do on an electron that moves along the y-axis from y = a to y = b? (use the following as necessary: a, b, ε0, λ, and q for the charge on an electron.)