Question

A particle in free-fall: takes 42 seconds to travel 490 meters at g= 9.8 m/s2.

Answer 1

time t=42sec
height h=490 m
gravitational acceleration g=9.8m/sec^2

Answer 2

now wt do u wanna know

Answer 3

we know
h=ut+(1/2)gt^2
490=u*42+(1/2)*9.8*42^2
now u can find out the value of u
here u is initial velocity