00:02
Hi, in this question we have a block having mass m given as 10 kg and it slides from point a down a frictionless curve to point b.
00:13
Now after the block passes point b, we have a frictional force that opposes this motion and it comes to a stop after 10 meters from b.
00:26
So let it come to stop at this point, which is point c and it is at a distance of 10 meter.
00:34
Now the coefficient of kinetic friction between the block and the surface after position b is given as 0 .3.
00:43
So new is given as 0 .3.
00:45
So they're asking us to calculate how high is point a above point b.
00:51
So here, let if we let that capital h is the height from a to b, then change in potential energy will be equals to change in kinetic energy.
01:08
So this is from law of conservation of energy.
01:11
So we can write mgh equals to half of mv square...