Question

Neglecting the effect of air resistance a stone dropped off a 175 m high building lands on the ground in a)3s. b)4s. c)6s. d)18s​

Answer 1

Answer:

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Explanation:

Here,

u=0 m/s

t=?

g=9.8m/s²

s= 175 m

We have,

$s = ut + \frac{1}{2} g {t}^{2} \\ = > 175 = 0.t + \frac{1}{2} \times 9.8 \times {t}^{2} \\ = > 175 = \frac{1}{2} \times 9.8 \times {t}^{2} \\ = > {t}^{2} = \frac{175}{4.9} \\ = > t = \frac{ \sqrt{1750} }{7} \\ = > t = 41.8 \div 7 = 6 \: \: \: \: \: \: approx$

c) is correct.