An engineer must a runway to accommodate air planes that must reach a ground velocity of 61m/s before they can take off. These planes are capable of being accelerated uniformly at the rate of 2.5m/s^2. a)How long will it take the planes to reach takeoff speed?
b)What must be the minimum length of the runway?

True or false when elements combine to form a mixture, the resulting chemical properties may be very different from those of the elements that make it.

Will give brainliest! which statement best describes the difference between strong nuclear forces and weak nuclear forces? weak nuclear forces are involved when certain types of atoms break down. strong nuclear forces are responsible for holding atoms' nucleus together. weak nuclear forces hold bonds between atoms together. strong nuclear forces hold together the nucleus of an atom. strong nuclear bonds prevent atoms from falling apart. weak nuclear bonds prevent compounds from falling apart. strong nuclear forces are involved in breaking electrons from their shells. weak nuclear forces hold protons in the nucleus.

What sort of waves exhibit the doppler effect?