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An object A is kept at the point x=3m and y=1.25m on a plank raised above the ground. At time t=0 the plank starts moving along the +x direction with an accleration 1.5m/s2. At the same instant a stone is projected from the origin with a velocity u as shown. A stationary person on the ground observes the stone hitting the object during its downward motion at an angle of 45 degree to the horizontol. All the motions are in the x-y plane. Find u and the time after which the stone hits the object. Take g=10m/s2.

An object A is kept at the point x=3m and y=1.25m on a plank raised above the ground. At time t=0 the plank starts moving along the +x direction with an accleration 1.5m/s2. At the same instant a stone is projected from the origin with a velocity u as shown. A stationary person on the ground observes the stone hitting the object during its downward motion at an angle of 45 degree to the horizontol. All the motions are in the x-y plane. Find u and the time after which the stone hits the object. Take g=10m/s2.

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