jee-main 2025 Q3

jee-main · India · session2_04apr_shift1 Constant acceleration (SUVAT) Acceleration then deceleration (two-phase motion)
Q3. A train starting from rest first accelerates uniformly up to a speed of $80 \mathrm {~km} / \mathrm { h }$ for time $t$, then it moves with a constant speed for time $3 t$. The average speed of the train for this duration of journey will be (in $\mathrm { km } / \mathrm { h }$ ) :
(1) 40
(2) 80
(3) 30
(4) 70 
Q3. A train starting from rest first accelerates uniformly up to a speed of $80 \mathrm {~km} / \mathrm { h }$ for time $t$, then it moves with a constant speed for time $3 t$. The average speed of the train for this duration of journey will be (in $\mathrm { km } / \mathrm { h }$ ) :\\
(1) 40\\
(2) 80\\
(3) 30\\
(4) 70
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