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Standard XII

Physics

Range

A particle is...

Question

A particle is projected at $20 m / s$ horizontally. What is its speed at $5 sec (g = 10 m / s^{2})$ :-

54 m / s

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20 m / s

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50 m / s

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70 m / s

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Solution

The correct option is A $54 m / s$
Horizontal speed will remain $c o n s t a n t$ but the vertical component will get chnged from $z e r o$ to $g t = 10 \times 5 = 50 m / s$
So resultant speed will be $\sqrt[2]{50^{2} + 20^{2}} = 53.85 m / s$ which is nearly $54 m / s$
Option A is correct.

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A particle is projected at 20m/s horizontally. What is its speed at 5sec(g=10m/s2):-

The correct option is A 54m/sHorizontal speed will remain constant but the vertical component will get chnged from zero to gt=10×5=50m/sSo resultant speed will be 2√502+202=53.85m/s which is nearly 54m/sOption A is correct.

A particle is projected at $20 m / s$ horizontally. What is its speed at $5 sec (g = 10 m / s^{2})$ :-

The correct option is A $54 m / s$
Horizontal speed will remain $c o n s t a n t$ but the vertical component will get chnged from $z e r o$ to $g t = 10 \times 5 = 50 m / s$
So resultant speed will be $\sqrt[2]{50^{2} + 20^{2}} = 53.85 m / s$ which is nearly $54 m / s$
Option A is correct.