You start pushing a heavy box down the school hallway. The box, which has a mass of 30.0 kg, accelerates at 2.0 m/s2. If the force of friction on the box is 20.0 N, how much force did YOU exert on the box in order to move it that quickly and overcome friction?

the answer is 12 as i may remember

: )

initial speed when it is dropped is 150 ft/s

now at the same moment the acceleration due to gravity is perpendicular to its velocity

so as we know that

now we have centripetal acceleration a = 32 ft/s^2 as its perpendicular to velocity

while tangential acceleration at the same moment will be zero

so

now radius of curvature is given as

so the radius of curvature just after it is dropped is 703.125 ft