Q.28. At t = 0, a body of mass 100 g starts moving under the influence of a force N. After 2s its po

Q: What is the correct answer for JEE Main Physics Q28?

The correct answer is D. Sol. Mass m = 100 g = 0.1 kg Force $\mathbf{F} = (5\mathbf{i}+10\mathbf{j})$N Acceleration $\mathbf{a} = \frac{\mathbf{F}}{m} = \frac{(5\mathbf{i}+10\mathbf{j})}{0.1} = (50\mathbf{i}+100\mathbf{j})$ m/s$^2$ Initial velocity $\mathbf{u} = 0$ (starts moving) Position $\mathbf{s} = \mathbf{u}t + \frac{1}{2}\mathbf{a}t^2$ $\mathbf{s} = 0 + \frac{1}{2}(50\mathbf{i}+100\mathbf{j})(2)^2$ $\mathbf{s} = \f

Q: Q.28. At t = 0, a body of mass 100 g starts moving under the influence of a force N. After 2s its position is m . The ratio x : y is

The correct answer is D. Sol. Mass m = 100 g = 0.1 kg Force $\mathbf{F} = (5\mathbf{i}+10\mathbf{j})$N Acceleration $\mathbf{a} = \frac{\mathbf{F}}{m} = \frac{(5\mathbf{i}+10\mathbf{j})}{0.1} = (50\mathbf{i}+100\mathbf{j})$ m/s$^2$ Initial velocity $\mathbf{u} = 0$ (starts moving) Position $\mathbf{s} = \mathbf{u}t + \frac{1}{2}\mathbf{a}t^2$ $\mathbf{s} = 0 + \frac{1}{2}(50\mathbf{i}+100\mathbf{j})(2)^2$ $\mathbf{s} = \f

Question

Q.28. At t = 0, a body of mass 100 g starts moving under the influence of a force N. After 2s its position is m . The ratio x : y is

FirstInTest · Accepted Answer

Sol. Mass m = 100 g = 0.1 kg
Force $\mathbf{F} = (5\mathbf{i}+10\mathbf{j})$N
Acceleration $\mathbf{a} = \frac{\mathbf{F}}{m} = \frac{(5\mathbf{i}+10\mathbf{j})}{0.1} = (50\mathbf{i}+100\mathbf{j})$ m/s$^2$
Initial velocity $\mathbf{u} = 0$ (starts moving)
Position $\mathbf{s} = \mathbf{u}t + \frac{1}{2}\mathbf{a}t^2$
$\mathbf{s} = 0 + \frac{1}{2}(50\mathbf{i}+100\mathbf{j})(2)^2$
$\mathbf{s} = \frac{1}{2}(50\mathbf{i}+100\mathbf{j})(4) = (100\mathbf{i}+200\mathbf{j})$ m
Given position is $(2x\mathbf{i} +5y\mathbf{j})$m
Comparing components:
$2x = 100 \Rightarrow x = 50$
$5y = 200 \Rightarrow y = 40$
Ratio x : y = $50 : 40 = 5 : 4$.

Answer

2

Answer

5

Answer

2

Answer

4

Related Questionsin Physics

More from JEE Main

Browse Engineering Questions by Subject

Practice More JEE Main Questions