Question

A rider in a hot air balloon is at a height of 60 meters and travelling downward at 3 m/s when they drop their cell phone. How long will it take for their phone to strike the ground?

Answer 1

here,

the height , h = 60 m

the initial velocity , u = 3 m/s

let the time taken to hit the ground be t

using second equation of motion

h = u * t + 0.5 * g * t^2

60 = 3 * t + 0.5 * 9.81 * t^2

solving for t

t = 3.21 s

the time taken is 3.21 s