A $8000 \,kg$ engine pulls a train of $5 $ wagons, each of $2000\, kg$, along a horizontal track. If the engine exerts a force of $40000 \,N $ and the track offers a friction force of $5000\, N$, then calculate:  the acceleration(in $m/s^2$) of the train

When a carpet is beaten with a stick, dust comes out of it. Explain.

According to the third law of motion when we push on an object, the object pushes back on us with an equal and opposite force. If the object is a massive truck parked along the roadside, it will probably not move. A student justifies this by answering that the two opposite and equal forces cancel each other. Comment on this logic and explain why the truck does not move.

An object experiences a net zero external unbalanced force. Is it possible for the object to be travelling with a non-zero velocity? If yes, state the conditions that must be placed on the magnitude and direction of the velocity. If no, provide a reason.

Why do you fall in the forward direction when a moving bus brakes to a stop and fall backwards when it accelerates from rest?