Question

please answer quick...........question no.1

Answer 1

90 km/h=90*5/18
=25 m/s

since

v²=u²+2as
=25²=0+2as
=625=2as
as=625/2

since

power=force *displacement/time
25*1000=ma*s/t
25000=1200*625/2*1/t
25000=600*625*1/t
25000*=375000*1/t
25000/375000=1/t
t=375000/25000
=375/25
=15 s
thus 1 option is correct