Idon't know how to do question c at the very bottom. could somone explain. you!

170-68 = 102 meters to catch the antelope

from a) 1 stride = 7 meters in 0.28 seconds

102/7 = 14.57 strides x 0.28 = 4.08 seconds total

V=D/T = 102/4.08 = 25 meters/second

1m/s = 3.6 K/H

25 x 3.6 = 90 Kilometers/ hour

d

explanation:

v=uf/(u-f)

= 5.10/(5-10) convex lens has positive focal length

=50/-5

=-10 cm (formed at other side)