if a bird is sitting on a seat in a plane that is travelling 300 km/h[E], if the bird jumps for a couple seconds will he: land on the front of the bus, back of the bus, one seat ahead, one seat behind, on the same seat he was standing on
same seat
assuming that the windows are closed...
To determine where the bird will land if it jumps, we can consider the motion of the bird relative to the plane. Since the bird is already sitting on a seat in the plane, it is already moving at the same speed as the plane, 300 km/h[E]. When the bird jumps, it retains this velocity until acted upon by external forces.
Assuming there are no external forces acting on the bird during the jump, it will continue to move with the same horizontal velocity as the plane. Therefore, relative to the plane, the bird will appear to remain in the same position and land on the same seat it was standing on.
From the perspective of an outside observer on the ground, however, the bird's motion will be a combination of its horizontal velocity due to the plane's motion and its vertical motion due to jumping. If the bird jumps straight up and down, without any forward or backward motion, it will land back in the same position when it comes back down. This means it will land on the same seat it was sitting on before it jumped.
So, the answer is that the bird will land on the same seat it was standing on when it jumps, both from the bird's perspective in the plane and from an outside observer's perspective on the ground.