M mtsmahia Member Joined Jun 21, 2008 Messages 284 Gender Male HSC 2010 May 5, 2009 #1 A trolley, of mass 3kg, moving at 8m/s, is acted on by a force of 15N until its speed doubles. What acceleration does the force produce, and how long does it act? Thanks!!
A trolley, of mass 3kg, moving at 8m/s, is acted on by a force of 15N until its speed doubles. What acceleration does the force produce, and how long does it act? Thanks!!
N n_otesguy Ed Joined Feb 3, 2006 Messages 10 Gender Male HSC 2007 May 5, 2009 #2 Use F=ma to work out the acceleration: 15=3a -> a=5 ms^-2 We know that the "final" speed doubles, and the initial speed is 8m/s, so using one of the equations of kinematics we have: v=u+at 16=8+5t t=8/5 s.
Use F=ma to work out the acceleration: 15=3a -> a=5 ms^-2 We know that the "final" speed doubles, and the initial speed is 8m/s, so using one of the equations of kinematics we have: v=u+at 16=8+5t t=8/5 s.
