# The skier goes down from the mountain 50 m in 5 s. Descending from the mountain and continuing to move

September 20, 2021 | education

| **The skier goes down from the mountain 50 m in 5 s. Descending from the mountain and continuing to move, he goes to a full stop for another 30 m in 15 s. Find the average speed of the skier over the entire movement.**

S1 = 50 m.

S2 = 30 m.

t1 = 5 s.

t2 = 15 s.

Vav -?

Average speed Vav is determined by the formula: Vav = S / t. Where S is the entire distance that the body has traveled in time t.

S = S1 + S2.

t = t1 + t2.

Vav = (S1 + S2) / (t1 + t2).

Vav = (50 m + 30 m) / (5 s + 15 s) = 4 m / s.

Answer: the average speed of the skier is Vav = 4 m / s.

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