A gymnast of mass 40 kg40\text{ kg}40 kg jumps off a raised platform and lands on a soft safety mat. When she reaches the safety mat, she takes 160 milliseconds160\text{ milliseconds}160 milliseconds to slow down and come to a complete stop. During this landing, an average force of 1500 N1500\text{ N}1500 N is exerted on her feet by the safety mat. Calculate the velocity of the gymnast at the instant she first touched the mat. Show your working.
Practise AQA GCSE Physics Momentum (HT only) with exam-style questions for Foundation and Higher tier. 9 questions covering Momentum is a property of moving objects, Conservation of momentum, and Changes in momentum (physics only), matched to the AQA GCSE Physics (8463) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.