How does the focal length (f) of a convex lens compare with the focal length
of a concave lens?

A. Both are negative.
B. The focal length of the convex lens is positive, and that of the
concave lens is negative.
C. The focal length of the convex lens is negative, and that of the
concave lens is positive.
D. Both are positive.

In which situation is the acceleration of a car negative? question 5 options: a)the velocity of a car was 75 km/hr over 4 hours. b)the velocity of a car reduced from 50 km/hr over one minute. c)the velocity of a car increased from 40 km.h to 75 km/h over 15 minutes. d)the velocity of a car was 45 km/hr at 2: 00pm and at 4: 00pm its velocity was 85 km/ht.