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Q.

A ball rolls off the edge of a horizontal table top 4 m high. If it strikes the floor at a point 5 m horizontallyaway from the edge of the table, what was its speed at the instant it left the table?

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a

2.5 ms-1

b

3.5 ms-1

c

5.55 ms-1

d

6.5 ms-1

answer is C.

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Detailed Solution

Using,  h=12gt2,  we gethAB=12gtAC2 or tAC=2hABg=2×49.8=0.9 sFurther,  BC=vtACor   v=BCtAC=50.9=5.55 ms-1
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A ball rolls off the edge of a horizontal table top 4 m high. If it strikes the floor at a point 5 m horizontallyaway from the edge of the table, what was its speed at the instant it left the table?