[1pt] For each of the four statements, select the matching graph. E.g., if graph

Question

[1pt] For each of the four statements, select the matching graph. E.g., if graph A corresponds to the first statement, graph C to the second, and none of the graphs to statements 3 and 4, enter ACNN.


(i) A student walks slowly to the bus stop, realizes she forgot her homework and quickly walks back home to get it.

(ii) A car starts from rest, steadily speeds up to a final speed in 15 seconds, stays at that speed for 10 seconds and decelerates to a stop in 5 seconds.

(iii) Find the v-t graph that corresponds to this graph:

(iv) A car is moving at constant speed.

Explanation / Answer

(i) student walk slowly

so initially velocity is +ve (value is less) now he stops then return . so velocity will become negative for that instant and value (in -ve) will be more than positive velocity as initally he as walking slowly then faster in opposit direction.

Grapg (B)

(Ii) for 15 min, slope of v vs t will be +v then it will be straight line parallel to x axis for 10 min then it will be line with negative slope and v becomes zero. (end at x axis.)

none graph

(iii) slope of x vs t curve will give as velocity.

1st portion is straight line (-ve value) parallel to x axis,

slope is zero so v will be zero for this time period.

2nd portion. straight line with positive slope.

so now velocity is constant (some +ve value and line parallel to x axis.)

3rd portion again velocity is zero.

Graph(D)

(iv) car moving with constant speed.

it will be straight line parallel to x axis. (for v vs t curve)

and it will be straight line with slope . (for x vs t curve)

that is graph C.

Ans. B N D C

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