What is the acceleration of an object that moves at constant velocity? what is the net force on the object in this case?

Tommy was walking at a rate of 4 miles per hour at noon and at 12:30 pm he was walking at a brisk rate of 6 miles per hour. Two hours later tommy was walking at a leisurely rate of 2 miles per hour.

The drawing shows two planes each dropping an empty fuel tank. At the moment of release each plane has the same speed of 140 m/s, and each tank is at the same height of 3.98 km above the ground.

a train is travelling up an a 3.73 degrees incline at a speed of 3.25m/s when the last car breaks free and begins to coast without friction. How long does it take for the last car to come to rest momentarily?

Standard temperature and pressure are defined as

You are the design engineer in charge of testing the crashworthiness of new automobile models. Cars are tested by smashing them into fixed, massive barriers at 50 km/h (30 mph). A new model of mass 1500 kg takes 0.

If the density in an object is 30 g/cm3 and it's volume is 10 cm3 what is the mass in grams

A star of uniform mass with a radius R rotates about its diameter with angular momentum L. Under the action of internal forces the star collapses until its radius is one fourth of its initial size.

What is most likely happen if there was an error during translation of protein?

Differents between foundamental quantity and derived quantities

A tiny pig is dropped from the top of a building and lads safely on a trampoline. The tiny pig will have an increase in what type of energy as it falls?