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**1. Homework Statement**

An object is dropped from a tower. If it had been thrown down at 60m/s, it would have taken half the time. What is the height of the tower? (acceleration is 10m/s^ down)

**2. Homework Equations**

d= v1(t)+1/2a(t)^ ----> I think you could use this

a=v2-v1/t --> maybe

**3. The Attempt at a Solution**

a= -10m/s^

v=60m/s

t=?

d=?

t=v/a

t=60/-10

t=-6 s (which doesn't make sense since time can't be negative in this case)

If it helps the answer is 320 m. I'd really appreciate it if you could help me and explain step by step! :) thanks