A physicist has told the jury looking at the murder of a New Zealander in Perth the speed that he was pushed through a window would have caused it the glass to break.
Andy Marshall, the cousin of slain Feilding farmer Scott Guy, was pushed out of the second-story window of a Perth bar in an apparently unprovoked attack.
He was killed in May last year, just several months after Guy was found shot dead at the end of his driveway.
Marshall, 29, who was from Feilding but was living in Perth, was at the Ocean Beach Hotel, talking to a couple of women when Stefan Pahia Schmidt, 26, approached him.
It was reportedly the first time Marshall had met his alleged killer. Minutes later he had fallen five metres to the path below and died hours later in hospital.
Schmidt is on trial at the Supreme Court of Western Australia.
The jury have already heard from witnesses from the bar that night who told the court that Schmidt arrived at the hotel with a large group, including the two women Marshall was speaking to.
He had approached Marshall and the women, yelling at them to leave, and then pushed Marshall through a window, witnesses said.
As the trial continued yesterday, Dr Ralph James, a University of Western Australia physicist, was called upon to give evidence.
James had conducted tests on the windows of the Cottesloe's Ocean Beach Hotel (OBH) in February this year.
In an attempt to find out the force needed to break the windows he conducted a series of static and dynamic tests, the court heard.
James told the court that no windows broke in the static tests, however, in the dynamic tests, in which a 23.6kg weight was swung at the windows, they did break.
He said it was speed, not weight, that was the dominant factor in determining the minimum force needed to break the windows.
The court heard underlying factors, such as pre-existing weakness in the glass also played a vital role in determining the force needed to break the glass.
James conceded to defence lawyer Tom Percy that he'd never carried out such tests before on glass. He said in the past he had conducted smash tests on eggshells, cork and rubber.
Prior to the testing James said he'd been told a person had been pushed through a window of the hotel and that the person had died.
When questioned about the comparatively low weight of the load cell to that of Marshall's 90kg at the time of his death, James said weight was not a major indicator of the force need to break the window.
The trial continues.
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