Question

Consider two observers moving with respect to each other at a speed v along a straight line,

Answer 1

Acceleration of the block

Reason: In the reference frame of both observers, same net force will be applied and causes same acceleration.

Answer 2

Answer:

acceleration of the block

Explanation:

as both the observers are moving with relative velocity v they do not have a relative acceleration. this means that when they observe the block in their respective frames the relative acceleration of block is same. rest all quantities will be different like displacement, velocity, and kinetic energy