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17.A helicopter moving vertically upwards, releases a packet when it is at a certain height above the ground. The packet initially moves upwards for a time t1 and then falls downward for a time t2 until it reaches the ground. Then 1.t1 t2 4. Data insufficient |
| Answer» 17.A helicopter moving vertically upwards, releases a packet when it is at a certain height above the ground. The packet initially moves upwards for a time t1 and then falls downward for a time t2 until it reaches the ground. Then 1.t1 t2 4. Data insufficient | |