Question

a 10 g bullet is fired at a plank of wood with a speed of 200 m/s after passing through the plank which is 1 m thick the speed of bullet reduces to 100 m/s find the average resistance offered by the plank​

Answer 1

Answer:

Using v2=u2−2as and putting v=100m/s, u=200m/s and s=1m

we get retardation a=1.5×104m/s2

so average resitance offered F=ma=(10/1000)1.5×104=150Kg m/s2=150Newton