Ball thrown upwards at velocity of 21.3 m/s what time will ball reach highest point

Consider an insulating crystal, made up of layers of atoms. what form would you expect the temperature dependence of the phonon heat capacity to approach at extremely low temperatures if the interlayer coupling is i)very strong (rigid coupling), and ii) very weak. explain.

For the car in the picture ,in which direction is the normal force? -into the screen -down -out of the screen -up

Avector a⃗ has a length of 8.6 m and points in the negative x direction. find the x component of the vector −3.7a⃗ .