An airplane dropped a flare from a height of 2860 feet above a lake. How many seconds did it take for the flare to reach the water?

Answer: 13.2 seconds.

Explanation: using equation of motion; S = ut + 1/2at² where u = initial velocity=0

S = distance travelled

a = acceleration due gravity

t = time.

1 foot = 0.305m so,

S = 2860 feet = 872.3m

S = ut+1/2 at²

872.3 = 0*t + 1/2*10 * t²

872.3 = 0 + 5t²

T² = 872.3/5

T² = 174.46

Take the square root of T we then have;

t = 13.2 seconds to one decimal place.

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