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CBSE Class 11-science Answered

A person goes to his office from his home daily at a fixed speed. But today he decided to reduce his speed by 20% as a result he reaches his office 16 minute late. What 's the actual/original time he takes to reach his office daily
Asked by Anil | 28 May, 2017, 06:50: PM
answered-by-expert Expert Answer
begin mathsize 12px style Let space the space distance space between space the space home space and space office space be space straight d. Initially space the space person space travels space with space speed space straight v subscript 1 space left parenthesis say right parenthesis space in space time space straight t subscript 1. New space speed space is straight v subscript 2 equals straight v subscript 1 minus 20 percent sign straight v subscript 1 equals straight v subscript 1 minus 20 over 100 straight v subscript 1 equals 4 over 5 straight v subscript 1 New space time space taken space is straight t subscript 2 equals straight t subscript 1 plus 16 space minutes As space the space distance space travelled space is space same straight v subscript 1 straight t subscript 1 equals straight v subscript 2 straight t subscript 2 down diagonal strike straight v subscript 1 end strike straight t subscript 1 equals 4 over 5 down diagonal strike straight v subscript 1 end strike cross times open parentheses straight t subscript 1 plus 16 close parentheses therefore 5 straight t subscript 1 equals 4 straight t subscript 1 plus 64 therefore straight t subscript 1 equals 64 space minutes end style
Answered by Romal Bhansali | 29 May, 2017, 12:41: PM

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CBSE 11-science - Physics
1. Explain path length and displacement with illustrations and distinguish them. 2. Define uniform velocity of an object moving along a straight line. What will be the shapes of position-time and velocity-time graphs of such a motion? Find the distance travelled by the uniformly accelerated object in one dimension in nth second. Draw velocity-time graph of a uniformly accelerated motion in one dimension and explain that the distance travelled is equal to the area under velocity-time graph. ted motion deduce the equations of motion in (i) From the velocity-time graph of uniform accelerated motion. velocity and time (ii) distance and time (iii) distance and velocity. Show that the vector addition of two vectors is different from scalar addition of two scalars. 7. What vectors. zero vector? How can you obtain zero vectors? Give examples and properties of zero It is easier to pull than to push a lawn roller. Explain with diagram. State triangle law vector. vector addition. Find analytically the magnitude direction resultant 10. State parallelogram law of vector addition. Find analytically the magnitude and direction of resultant vector, when (i) two vectors other. parallel to each-other (ii) two vectors perpendicular to each- 11. What a projectile? Give its examples. Show projected horizontally from a certain height.
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CBSE 11-science - Physics
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CBSE 11-science - Physics
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CBSE 11-science - Physics
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CBSE 11-science - Physics
A person goes to his office from his home daily at a fixed speed but today he decided to reduce his speed by 20% as a result he reaches his office 16 minute late. what's the actual time he takes to reach his office daily
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CBSE 11-science - Physics
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