A spring in a toy launcher has a spring constant of 800 N/m. The spring is stretched by 0.10 m.
When released, all of the energy stored in the spring is transferred to a ball of mass 0.040 kg.
Use the equation: energy transferred in stretching=0.5×spring constant×(extension)2\text{energy transferred in stretching} = 0.5 \times \text{spring constant} \times (\text{extension})^2energy transferred in stretching=0.5×spring constant×(extension)2
What is the speed of the ball as it leaves the launcher?
10 m/s10\ \text{m/s}10 m/s
14 m/s14\ \text{m/s}14 m/s
20 m/s20\ \text{m/s}20 m/s
200 m/s200\ \text{m/s}200 m/s
44 exam-style questions on OCR GCSE Physics 7.1 Work done, covering 7.1.1 Conservation of energy in a closed system, 7.1.2 Energy stores and transfers, 7.1.3 Energy changes by heating, forces and current, 7.1.4 Quantifying energy transfers in a system, and 7.1.5 Kinetic, elastic and gravitational potential energy. Each one has a worked solution and a mark scheme showing where the marks go.