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A small block is connected to one end of a masslessspring of un-stretched length 4.9 m. The other end ofthe spring (see the figure) is fixed. The system lies ona horizontal frictionless surface. The block is stretchedby 0.2 m and rcleased from rest at t 0. It then exccutessimple harmonic motion with angular frequency-rad/s. Simultaneously at t-0, a small pebble isprojected with speed v from point P at an angle of45° as shown in the figurc. Point P is at a horizontaldistance of 10 m from O. If the pebble hits the blockat 1 s, the value of v is (Take g 10 m/s)ひ10 m |
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Answer» wow are u in 8 th std |
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