SATHEE: Kinematics Question 593

Kinematics Question 593

Question: A particle has an initial velocity $3 \hat{i} + 4 \hat{j}$ and an acceleration of $0.4 \hat{i} + 0.3 \hat{j}$ . it’s speed after 10 sec is

Options:

A) 7 $\sqrt{2}$ unit

B) 7 unit

C) 8.5 unit

D)10 unit

Show Answer

Answer:

Correct Answer: A

Solution:

[a] $\vec{u} = 3 \hat{i} + 4 \hat{j} \Rightarrow u x = 3 and uy=4$

$\vec{a} = 0.4 \hat{i} + 0.3 \hat{j} \Rightarrow a x = 0.4$

$and ay = 0.3$

$So, V_{x} = u x + a_{x} t = 3 + 0.4 \times 10 = 3 + 4 = 7$ .

$V_{y} = uy+ a_{y} t = 4 + 0.3 \times 10 = 4 + 3 = 7$

$\vec{V} = 7 \hat{i} + 7 \hat{j}$

$\Rightarrow | \vec{V} | = \sqrt{7^{2} + 7^{2}} = 7 \sqrt{2} unit$

Kinematics Question 593

Question: A particle has an initial velocity $3 \hat{i} + 4 \hat{j}$ and an acceleration of $0.4 \hat{i} + 0.3 \hat{j}$ . it’s speed after 10 sec is

Options:

Answer:

Solution:

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Kinematics Question 593

Question: A particle has an initial velocity 3i^+4j^ and an acceleration of 0.4i^+0.3j^ . it’s speed after 10 sec is

Options:

Answer:

Solution:

Engineering Preparation

Medical Preparation

NCERT Books & Solutions

Important Resources

Other Resources

Syllabus

Test Platform

Sample Mock Test

Mentorship

NCERT Exercise Video Solution

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Question: A particle has an initial velocity $3 \hat{i} + 4 \hat{j}$ and an acceleration of $0.4 \hat{i} + 0.3 \hat{j}$ . it’s speed after 10 sec is