An object is dropped from a bridge. a second object is thrown downwards 1.00 s later. they both reach the water 20.0 m below at the same instant. what was the initial speed of the second object? an object is dropped from a bridge. a second object is thrown downwards 1.00 s later. they both reach the water 20.0 m below at the same instant. what was the initial speed of the second object? 19.6 m/s 21.3 m/s 14.6 m/s 9.90 m/s 4.91 m/s

Explanation:

Kinematics equation for first Object:

but:

      The initial velocity is zero

it reach the water at in instant, t1, y(t)=0:

Kinematics equation for the second Object:

The initial velocity is zero

but:

it reach the water at in instant, t2, y(t)=0. If the second object is thrown 1s later, t2=t1-1=1.02s

The velocity is negative, because the object is thrown downwards.

there are no contact forces mentioned on the list of choices that you've provided.