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A deer escapes from a leopard and runs a...

A deer escapes from a leopard and runs aways in straight line with constant velocity. The leopard again starts chasing the deer when the deer has ran a distance 64 m. The leopard starts with initial speed 30 m/s but due to fatigue it has to reduce its speed and it does so by reducing speed uniformly by 4 m/s every 2 s. At what minimum speed must the deer run to escape away from the leopard ?

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