1 2500kg railroad car moving with a speed of 3 m/s is linked with a 3500 kg railroad car moving away from the first car with a speed by 1 m/s. Both are moving along a straight track. Find the speed of the two cars just after they link up.

A 50.0 kg astronaut is standing on a 250.0 kg space capsule. He pushes off from the space capsule with a velocity of 10.0 m/s. How long does it take for him to reach a point 50.0 m away from the space capsule? (Hint: Not 5 seconds!)

Two blocks with masses m1 = 1.4kg and m2 = 4.6kg are at rest on a frictionless surface with a compressed spring between them. When the blocks are let go, block 1 is observed to have a velocity of 4.4m/s to the left. What is the speed of block 2?

Kaya, a crew member on an interplanetary space ship, is on a spacewalk.  She realizes that her ship is moving away from her at 0.5 m/s. She and her spacesuit have a total mass of 95 kg. Her space suit includes a 15 kg backpack, which is included in the 95 kg total mass.a). What is the minimum velocity she will have to throw the backpack so that she can gain enough velocity to eventually catch up with the ship? b). Kaya applies an average force of 400 N to the backpack for 0.05 seconds. Will Kaya make it back to the ship? If so, determine how much time it will take for her to reach the ship. If not, determine how much more force she would need to apply to make it back.

7. During a snowball fight, a 0.30-kilogram snowball traveling at a speed of 17.0 m/s hits a student in the back of the head. If the contact time is 0.10 s, what is the magnitude of the average force on the student's head? N ssf f60° Ossi 09 JS 50 ssf60

Tommy accidentally drops a 50 kg concrete block from the 20 m tall building with what speed does the brick hit the ground? Take g=9.8m/s2

A 6.0 ✕ 104 kg space probe is traveling at a speed of 12000 m/s through deep space. Retrorockets are fired along the line of motion to reduce the probe's speed. The retrorockets generate a force of 3.0 ✕ 105 N over a distance of 2400 km. What is the final speed of the probe? m/s

A toy car with a mass of 128 g moves to the right with a speed of 0.810 m/s. A small child drops a 30.0-g piece of clay onto the car. The clay sticks to the car and the car continues to the right. What is the change in speed of the car? Consider the frictional force between the car and the ground to be negligible. -0.15 m/s

8) Your mass is 68.8 kg, and the sled s mass is 11.3 kg. You start at rest, and then you jump off the sled, after which the empty sled is traveling at a speed of 3.10 m/s. What will be your speed on the ice after jumping off? Question 8 options:   0.36 m/s   0.71 m/s   0.61 m/s   0.51 m/s   9) Your mass is 87.6 kg, and the sled s mass is 14.4 kg. The sled is moving by itself on the ice at 3.16 m/s. You parachute vertically down onto the sled, and land gently. What is the sled s velocity with you now on it? Question 9 options:   0.45 m/s   0.32 m/s   0.77 m/s   0.61 m/s

A crane drops a 1.7 kg steel ball onto a steel plate. The ball's speeds just before impact and after are -8.5 m/s and 5.3 m/s, respectively. If the ball is in contact with the plate for 0.048 seconds, what average force does the ball exert on the plate during impact?