A mirror has an object located on its principal axis 40.0 cm from the mirror's surface. A virtual image is formed 15.0 cm behind
the mirror. What is the mirror's focal length?
a. -240 cm
C. 2.38 cm
b. -10.9 cm
d. 13 cm

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The substances that are necessary for producing of certain hormones and that store and transport vitamins

Ahot-air balloon is 11.0 m above the ground and rising at a speed of 7.00 m/s. a ball is thrown horizontally from the balloon basket at a speed of 9.00 m/s. ignore friction and air resistance and find the speed of the ball when it strikes the ground.