Question Number 30614 by NECx last updated on 23/Feb/18
$${Consider}\:{that}\:{two}\:{cars}\:{are}\: \\ $$$${accelerating}\:{along}\:{the}\:{same}\:{road} \\ $$$${and}\:{if}\:{the}\:{distance}\:{between}\:{them} \\ $$$${was}\:{observed}\:{to}\:{be}\:{increasing},{what} \\ $$$${deduction}\:{can}\:{you}\:{make}\:{as}\:{regards} \\ $$$${the}\:{acceleration}? \\ $$$$\left.{a}\right){it}\:{implies}\:{that}\:{the}\:{trailing}\:{car} \\ $$$${has}\:{the}\:{smaller}\:{acceleration} \\ $$$$\left.{b}\right){it}\:{implies}\:{that}\:{the}\:{two}\:{cars}\:{are} \\ $$$${accelerating}\:{at}\:{the}\:{same}\:{rate} \\ $$$$\left.{c}\right){it}\:{implies}\:{nothing}\:{about}\:{the} \\ $$$${acceleration} \\ $$$$\left.{d}\right){it}\:{implies}\:{that}\:{the}\:{leading}\:{car}\: \\ $$$${has}\:{the}\:{greater}\:{acceleration}. \\ $$
Answered by chintan005@ last updated on 23/Feb/18
$$\mathrm{ans}\:\mathrm{is}\:\mathrm{d} \\ $$
Commented by NECx last updated on 23/Feb/18
$${please}\:{do}\:{well}\:{to}\:{explain}\:{why}\:{you} \\ $$$${chose}\:{D}\:{as}\:{an}\:{answer}.{I}'{m}\:{more} \\ $$$${confused}\:{because}\:{the}\:{textbook}\:{says} \\ $$$${C}\:{as}\:{answer}\:{and}\:{there}'{s}\:{no} \\ $$$${explanation}.{Thanks}. \\ $$
Commented by MJS last updated on 24/Feb/18
$$\mathrm{it}\:\mathrm{says}\:\mathrm{nothing}\:\mathrm{about}\:\mathrm{the}\:\mathrm{acceleration} \\ $$$$\mathrm{because}\:\mathrm{we}\:\mathrm{don}'\mathrm{t}\:\mathrm{know}\:\mathrm{the}\:\mathrm{initial} \\ $$$$\mathrm{speeds}\:\mathrm{of}\:\mathrm{the}\:\mathrm{cars}.\:\mathrm{the}\:\mathrm{leading}\:\mathrm{car} \\ $$$$\mathrm{could}\:\mathrm{still}\:\mathrm{be}\:\mathrm{faster}\:\mathrm{even}\:\mathrm{if}\:\mathrm{its}\:\mathrm{acc}. \\ $$$$\mathrm{is}\:\mathrm{lower} \\ $$