Which type of mirror always has an image that is smaller than the object?

Aball is thrown straight up into the air with a speed of 21 m/s. if the ball has a mass of 0.1 kg, how high does the ball go? acceleration due to gravity is g = 9.8 m/s^2. a. 22.5 m b. 20.0 m c. 25.0 m d. 17.5 m

Could someone me find the answer to this problem.

Clothes dryer uses about 7 amps of current from a 240 volt line. how much power does it use?