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Standard X

Physics

Power

A block of ma...

Question

A block of mass $2 k g$ starts moving with initial speed of $10 m / s$ and accelerates at $- 2 m / s^{2}$ . How much time will pass until it comes to rest?

2 s

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4 s

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5 s

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12 s

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20 s

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Solution

The correct option is C $5 s$
Given that: $m = 2 k g; u = 10 m / s; a = - 2 m / s^{2}$

Using first equation of motion:
$\Rightarrow v = u + a t$
$\Rightarrow 0 = 10 - 2 t$
$\Rightarrow t = \frac{10}{2} = 5 s e c$

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A block of mass 2 kg starts moving with initial speed of 10 m/s and accelerates at −2m/s2. How much time will pass until it comes to rest?

The correct option is C 5sGiven that: m=2 kg;u=10 m/s;a=−2 m/s2Using first equation of motion:⇒v=u+at⇒0=10−2t⇒t=102=5 sec

A block of mass $2 k g$ starts moving with initial speed of $10 m / s$ and accelerates at $- 2 m / s^{2}$ . How much time will pass until it comes to rest?

The correct option is C $5 s$
Given that: $m = 2 k g; u = 10 m / s; a = - 2 m / s^{2}$

Using first equation of motion:
$\Rightarrow v = u + a t$
$\Rightarrow 0 = 10 - 2 t$
$\Rightarrow t = \frac{10}{2} = 5 s e c$