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yulyashka [42]
3 years ago
11

PLEASE HELP ASAP!! WILL GIVE BRAINLIEST

Physics
1 answer:
nignag [31]3 years ago
8 0
I think it may be c
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An object is dropped from a platform 400 ft high. Ignoring wind resistance, how long will it take to reach the ground?
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Let's convert the initial height from feet to meters first:
h=400 ft=121.9 m

The object is in free fall, so it is moving by uniformly accelerated motion with constant acceleration g=9.81 m/s^2 (gravitational acceleration) from initial height h=121.9 m. Its vertical position at time t is given by
y(t)=h- \frac{1}{2}gt^2

We want to know how long it will take to reach the ground, therefore we should calculate the time t at which the vertical position y(t) becomes zero:
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rearranging,
t= \sqrt{ \frac{2h}{g} }= \sqrt{ \frac{2(121.9 m)}{9.81 m/s^2} }=4.98 s
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