A ball is dropped from the window of a stationary train and lands to the ground after 6 seconds . How much time will the ball take to land if the train is moving with (a) uniform speed of 60 km/hr and (b) uniform acceleration of `4 km//h^(2)`?

Explanation

To solve the problem, we need to analyze the motion of the ball in two scenarios: when the train is moving with a uniform speed and when it is accelerating.

### Given:
- The ball is dropped from a stationary train and takes 6 seconds to hit the ground.
- We need to find out how long it will take for the ball to land when the train is moving at a uniform speed of 60 km/hr and when it is accelerating at 4 km/hr².

### Step 1: Find the height from which the ball is dropped
Since the ball takes 6 seconds to hit the ground when dropped from a stationary train, we can calculate the height (h) using the equation of motion:
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