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A particle has an initial velocity 3 \ha...

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 10s is

A

7 units

B

8.5 units

C

10 units

D

`7 \sqrt { 2 }` units

Text Solution

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The correct Answer is:
D
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Knowledge Check

  • A particle has an initial velocity 2 \hat { \i } + 3 \hat { \j } and acceleration 0.3 \hat { \i } + 0.2 \hat { \j } . The magnitude of velocity after 10 seconds will be:

    A
    9`\sqrt { 2 }` units
    B
    5`\sqrt { 2 }` units
    C
    5 units
    D
    9 units

  • If the vector 8 hat i + a hat j of magnitude 10 is in the direction of the vector 4 hat i - 3 hat j , then the value of a is equal to

    A
    6
    B
    3
    C
    `-3`
    D
    `-6`

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