A body is projected horizontally with speed 20 m s - 1 . The speed of the body after 5 s is nearly

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A body is projected horizontally with speed

20 m s^{- 1}

. The speed of the body after

5 s

is nearly

PhysicsMotion In Two DimensionsNEET

Options:

A $54 m s^{- 1}$
B $35 m s^{- 1}$
C $20 m s^{- 1}$
D $70 m s^{- 1}$

Solution:

1189 Upvotes Verified Answer

The correct answer is:

54 m s^{- 1}

v_{x} = u = 20 m s^{- 1}

v_{y} = v_{u} + g t

= 0 + 10 \times 5 = 50 m s^{- 1}

v = \sqrt{u_{x}^{2} + u_{y}^{2}}

= \sqrt{{(20)}^{2} + {(50)}^{2}} = 54 m s^{- 1}

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