A lorry accelerates uniformly in a straight line with acc...
A lorry accelerates uniformly in a straight line with acceleration of 4ms−2 and covers a distance of 250 m in a time interval of 10 s. How far will it travel in the next 10 s?
650
900
800
250
Correct answer is A
We first find the lorry's initial velocity
a = 4ms−2, s= 250m, t= 10, u=?
⇒ ut + 12×4×(102)⇒250=10u+200⇒250−200=10u⇒50=10u⇒U=5010 = 5ms−1
For the next 10s, we set t=20s
= s = (5 × 20) + 12×4×202
= s = 100 + 800
⇒ 900 m
;Distance covered:900-250 =650m