A physics student climbs a tree. To measure how high she has climbed she drops a rock. It takes 1.3 seconds for the rock to hit the ground. How many feet has she climbed?

1 Answer

She has climbed 8.3 m.

Explanation:

Summarise data:

t= 1.3 s
a= 9.8 ms^-2 (acceleration due to gravity)
s = ? m
u = 0 ms^-1

s= ut + 1/2 at^2
s = 0 \times 1.3 + 1/2 \times 9.8 \times 1.3^2

s= 8.281 m, but we were only given two significant digits in the question, so we should only give two in the answer, so s = 8.3 m.