An object falls 210 m in 6.3 s. What was it's initial velocity? Express your answer with the correct number of significant digits.

Question

asked Nov 4, 2021 52.9k views

1 Answer

Himanshu Patel · Answer 1 · 2021-11-08T03:38:02+0000

Answer:

$u = 2.5 \ m/s$

Step-by-step explanation:

Given data:

Height,
$h = 210 \ m$

Time,
$t = 6.3 \ s$

Let the initial velocity of the object be u.

From the kinematic equation,

h = ut + (1)/(2)gt^(2)

210 = u * 6.3 + 0.5 * 9.80 * (6.3)^(2)

$\Rightarrow \ u = 2.46 \ m/s$

$u = 2.5 \ m/s$ (rounding to tenth place)