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A dynamite blast blows a heavy rock st...

A dynamite blast blows a heavy rock straight up with a launch velocity of 160 m/sec . If reaches a height of `s=160\ t-16 t^2"a f t e r"\ tdotsecdot` The velocity of the rock when it is `256\ m` above the ground on the way up is 98 m/s (b) 96 m/s 104 m/s (d) 48 m/s`

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