Which of the following speed-time (v-t) graph | vedclass

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(D) In a physically possible speed-time $(v-t)$ graph,for any given instant of time $t$,there must be a unique value of speed $v$. $1$. In graph $A$,a

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All of these

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(D) In a physically possible speed-time $(v-t)$ graph,for any given instant of time $t$,there must be a unique value of speed $v$. $1$. In graph $A$,at a certain time $t$,there are two different values of speed $v$,which is impossible. $2$. In graph $B$,for a single time $t$,there are multiple values of speed $v$ due to the curve folding back on itself,which is impossible. $3$. In graph $C$,the speed $v$ becomes negative. By definition,speed is a scalar quantity and is always non-negative $(v \ge 0)$. Therefore,a graph showing negative speed is physically impossible. Since all three graphs violate the fundamental definitions of speed and time,all of them are physically impossible.

$(1)$ Velocity decreases	$(a)$ Linear graph (constant slope)
$(2)$ Velocity increases	$(b)$ Concave up graph (increasing slope)
$(3)$ Velocity is constant	$(c)$ Concave down graph (decreasing slope)

Which of the following speed-time $(v-t)$ graphs is physically not possible?

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