A sand dispenser releases dry sand from a height of 7.2 m7.2\text{ m}7.2 m above a weighing platform. The sand starts from rest and falls vertically onto the platform.
Show that the velocity of the sand when it strikes the platform is 12 m/s12\text{ m/s}12 m/s. [Take g=10 m/s2g = 10\text{ m/s}^2g=10 m/s2.]
Sand flows from the dispenser onto the platform at a rate of 15 kg15\text{ kg}15 kg every second. Calculate the force exerted on the platform by the falling sand as it comes to rest on impact. [Ignore any bouncing of the sand.]
78 exam-style questions on CIE IGCSE Physics Momentum, covering Momentum. Each one has a worked solution and a mark scheme showing where the marks go.