An object moving at 21.0 m/s has 1390 J of kinetic energy. What is the object's mass? A. 6.30 kg B. 66.2 kg C. 3.15 kg D. 33.1 kg

Pls help ASAP on both pls i beg

036. A 1.50 kg model train initially traveling at 0.50 m/s acceler- ates to 1.00 m/s in 10. s. a. What is the change in the train's kinetic energy? b. How much power was expended to accelerate the train?

Gina's moped has an output of 6.0 horsepower (1 horsepower = 745.7 W), and its mass is 190 kg. 50 kg, how long does it take for her to reach a speed of 8.0 m/s if she starts her moped from rest? A. 0.92 s B. 1.3 s C. 2.2 s D. 1.7 s Gina's mass is

4. A 6.00 Kg iron ball moves at 2.75 m/s. How fast must a 2.65 g steal ball move so that the two balls have the same kinetic energy?

A 1.0 kg cart is sliding to the right on a frictionless surface with speed 2 m/s. It collides head-on and sticks to a d.5 kg cart that is sliding to the left with speed 4 m/s. What is the kinetic energy of the combined carts after the collision? (Hint: Make a table!) A.O 2J B.O4J C. 0 J D.O6J

An empty freight car with a mass of 10,000 kg rolls at 5 m/s along a level track and collides with a loaded car with a mass of 20,000 kg, standing at rest with brakes released. Friction can be neglected. If the cars couple together, find their speed after the collision. a. Find the decrease in kinetic energy as a result of the collision. b. With what speed should the loaded car be rolling towards the empty car for both to be brought to rest by the collision? Show the figure/fbd, given and formula used.

A 10.0 kg cart and a 15kg cart are locked together with a compressed spring between them. They are then released so that the spring pushes the two carts apart. The 15kg cart is moving at 3.0 m/s afterward. How fast is the 10.0 kg cart moving? A. 4.5 m/s B. 2 m/s C. 3 m/s D. 5 m/s

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E. 19.77 m/s 21.85 m/s C. 26.37 m/s F. 1--1 IYYVE On the roller-coaster shown, a car is moving 12 m/s toward the right at point 1. Assuming no friction, calculate the speed of the car at point 4. 3 40 m 26 m 4 15 m 21. A. 20.28 m/s D. 25.18 m/s 24.54 m/s B. 18.94 m/s E. F. C. 23.73 m/s 26.35 m/s 1--1 KTMDG A box slides from rest down a curved slope. Its initial height is 21 m above the ground, and it comes off the slope 7_m above the ground. How fast is the box moving as it leaves the slope? Assume friction is negligible. ^ Pigshow.jpeg Pig show.jpeg