First slide

Change of state

Question

A moving snowball is completely melted by its impact against a wall. The speed $(in {ms}^{- 1})$ of snow ball is

Easy

A

8.2 X 10² m / s
B

2.1 x 10² m / sec
C

16.4 x 10² m / s
D

none of these

Solution

$\begin{array}{l} \frac{1}{2} {mv}^{2} = mL \\ \frac{1}{2} \times v^{2} = 336 \times 10^{3} \\ v^{2} = 67 .2 \times 10^{4} \\ v \approx 8 .2 \times 10^{2} m / s \end{array}$

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