Total length of path covered by train = 400 + 150 = 550 m Train to cross the bridge (Find, Time Taken) = Total distance / speed = 550 / 50 = 11 s

On the sudden, application of break, the tanker will come in the state of rest but the water remains in the state of motion. So, the water will move forward.

Inertia of body is directly proportional to the mass of the body.

When we beat blanket with the help of stick, then it comes into motion. But the dust particles continue to be at rest due to inertia and get detached from the blanket.

Unbalanced force can only change the state of motion of an object but not the shape or size.