Can an object moving with a speed of 1000 m/s be in equilibrium? Explain

Yes

Explanation:

A system is said to be in equilibrium when the state of the system is balanced such that there is an equal amount of powers acting in opposite direction

For an object moving at a constant speed of 1000 m/s, given that, according to Newton's first law of motion, a body will continue in motion or at rest unless acted by a force, the object continue moving indefinitely, then the motion  in the object is in equilibrium or balanced or in agreement with the general external surrounding of the object.

ι вєℓιєνє ιт ιѕ тнє fιяѕт ¢нσι¢є(α.)

нє ѕнσυℓ∂ ѕмιℓє ρσℓιтℓу αи∂ ѕρєαк тσ тнє ρєяѕσи ωнσ ιѕ ιитєяяυριиg αfтєя тнє ∂ιѕ¢υѕѕισи

нσρє ι ¢συℓ∂ нєℓρ.

can be answered using momentum.

momentum = p

p1= mass1 * velocity1

p1 = p2

therefore

p1 = 6kg * 4m/s

p1 = 24kgm/s

p2=m2 * v2

24 kgm/s = 7kg * v2

v2 = 24 kgm/s / 7kg

v2= 3.42 m/s