Calculating Velocity of Free-Falling Object from Rest at Different Altitudes

[student1]

Homework Statement

A 100kg object is released from rest at an altitude of h=50km. Ignoring aerodynamic drag and wind behaviour, determine the velocity of the object just before it strikes the Earth at sea level, asumming gravity is 9.81 m/s^2 and constant

Homework Equations

F=G(m1m2)/r^2

F=ma

The Attempt at a Solution

F=967.74N
a=9.68m/s2

 

[tiny-tim]

Hi student1!

A 100kg object is released from rest at an altitude of h=50km. Ignoring aerodynamic drag and wind behaviour, determine the velocity of the object just before it strikes the Earth at sea level, asumming gravity is 9.81 m/s^2 and constant

Hint: use conservation of energy

 

[student1]

thank you very much