1.

For a particle moving along `x-`axis, speed must be increasing for the following graph `:`A. B. C. D.

Answer» Correct Answer - D
For `(1)` `:` For speeding up, signs of `v` and a must be same and for speeding down signs of `v` and a must be opposite.
For `(2)` `:` speed`=`[velocity] `:.` speed first`darr` then `uarr`
For `(3)` & `(4)` `:` speed `=`[slope of `x-t` graph]


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