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Problems with Pseudo Force

Find the forc...

Question

Find the force exerted by 5 kg block on floor of lift, as shown in figure. $(T a k e g = 10 m / s^{2})$

100 N

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115 N

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105 N

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135 N

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Solution

The correct option is C 105 N

$F_{n e t} = m a$
$N - 70 = 7 \times 5....... (i)$
$∴ N = 105 n e w t o n$
$F = 105 N$

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