it will reach the max height when t =3bacali wrote:OA: B
2 seconds later means 5 seconds
-16( 5-3)^2 + 150 = 86
hope its clear..
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Source: Beat The GMAT — Problem Solving |
2 seconds later means 5 seconds
-16( 5-3)^2 + 150 = 86
hope its clear..
how did you calculate that maxiumum height is 3? is it because that's when h is the highest? since -16 x time is negative?sudhir3127 wrote:it will reach the max height when t =3bacali wrote:OA: B
2 seconds later means 5 seconds
-16( 5-3)^2 + 150 = 86
hope its clear..
The only way I could see to determine the time it reaches max height is to take the derivative of h and set dh/dt = 0
dh/dt = -32 (t-3) = 0 => t =3
But I'm sure this is not expected in GMAT. Thoughts ??
dh/dt = -32 (t-3) = 0 => t =3
But I'm sure this is not expected in GMAT. Thoughts ??
The Max height is reached when the given formula reaches its max value for H, that is when t=3.hwiya320 wrote:how did you calculate that maxiumum height is 3? is it because that's when h is the highest? since -16 x time is negative?sudhir3127 wrote:it will reach the max height when t =3bacali wrote:OA: B
2 seconds later means 5 seconds
-16( 5-3)^2 + 150 = 86
hope its clear..
true, i started with this thought - if GMAT asks you to max something, then you to have min/reduce something else.
so in this case, since we have to find H, any value of T below 0 would be detrimental to our goal.
so in this case, since we have to find H, any value of T below 0 would be detrimental to our goal.
