A train travels 68 kilometers in 4 hours, and then 91 kilometers in 2 hours. What is its average speed?

Which of these events indicate that a chemical reaction might have occurred?

Newton's First Law of Motion states that an object in motion tends to stay in motion unless it A starts to decelerate. B runs out of kinetic energy. с is acted upon by another force. D approaches the speed of light

What is the advantage of having different shaped beaks? Question 4 options: To protect itself against prey. To be able to eat the food readily available in the environment. To look different from other species. To protect itself against predators.

A toy train rolls around a horizontal 1.0-m-diameter track. the coefficient of rolling friction is 0.10. how long does it take the train to stop if it's released with an angular speed of 40 rpm?

Which newtons law is when dominos are knocking eachother down?

A car is moving with a speed of 22 m/s. The driver then brakes, and the car comes to a halt after 6.5 s. What is the distance covered by the car after the driver brakes, until it comes to a stop? A) 36 m B) 72 m C) 140 m D) 210 m

Which of the following best explains why an explosive charge in a cannon can cause a cannonball to fly out of the cannon with a high velocity? A. because chemical potential energy can convert to gravitational potential energy B.

Distance divided by time what is velocity

The decay constant of a radioactive nuclide is 4.6 x 10^-3 s^-1. What is the half-life of the nuclide? 2.5 min 2.0 min 1.4 min 3.6 min 3.1 min

A furlong is an old british unit of length equal to 0.125 mi, derived from the length of a furrow in an acre of ploughed land. a fortnight is a unit of time corresponding to two weeks, or 14 days and nights.