How much time does it take a skater to increase her speed uniformly, from 3.0 meters per second to 7.0 meters
per second, over a distance of 10 meters?
a. 1.0 s
b. 4.0 s
c 6.0 s
d. 2.0 s

d. 2.0 s

Explanation:

Given:

v₀ = 3.0 m/s

v = 7.0 m/s

Δx = 10 m

Find: t

Δx = ½ (v + v₀) t

(10 m) = ½ (7.0 m/s + 3.0 m/s) t

t = 2.0 s

d

explanation:

v=uf/(u-f)

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

=50/-5

=-10 cm (formed at other side)

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