24- Which of the fallowing devices make use a lens a)microscope
b)projector
c)magnifying glass
d)all
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d.

Explanation:

all because the projector is a lens and the magnifying also the microscope

initial speed when it is dropped is 150 ft/s

now at the same moment the acceleration due to gravity is perpendicular to its velocity

so as we know that

now we have centripetal acceleration a = 32 ft/s^2 as its perpendicular to velocity

while tangential acceleration at the same moment will be zero

so

now radius of curvature is given as

so the radius of curvature just after it is dropped is 703.125 ft

you can cut your hand off if your not