A ball is thrown vertically upward from the ground

PHYSICS · Single correct · CBSE · Physics · Gravitation · Gravitation

Problem

A ball is thrown vertically upward from the ground. A student at a window

15\,\text{m}

above the ground sees it moving upward at

10\,\text{m s}^{-1}

. The velocity of the ball

3\,\text{s}

after projection is, taking

g=10\,\text{m s}^{-2}

, (1)

10\,\text{m s}^{-1}

upward (2)

20\,\text{m s}^{-1}

upward (3)

20\,\text{m s}^{-1}

downward (4)

10\,\text{m s}^{-1}

downward