Question

A body of mass 100 kg falls on the earth from infinity. What will be its velocity on reaching
he earth ? Energy ? Radius of the earth is 6400 km and g = 9.8 ms ? Air friction is negligible

Ashu meleko bhi bulana party me​

Answer 1

6.27 x 10

=mgR

=100×9.8×6400×1000

=6272000×1000

=6.27×10

​ Hence the right answer of this question is 6.27 x 10

hope that helps you

Answer 2

$\bold{ui+ki=u_f+k_f}$

$\bold{ \implies \: 0 + 0 = \frac{-GMm}{R} + \frac{1}{2} m {v}^{2}}$

$\bold{ = \frac{1}{2} m {v}^{2} = \frac{GMm}{R \times R} \times R}$

=mgR

=100×9.8×6400×1000

=6272000×1000

$\bold{=6.27×10^9J}$