Car 1 has a of mass 1000kg and is going at 20m/s. Car 2 has the same mass as Car 1 and is stationary. If they collide and travel together as one unit in the same direction as Car 1 was going, calculate the speed of the unit after the collision.
By Conservation of Momentum
Total Momentum Before= Total Momentum After
thus
m1v1+m2v2=(m1+m2)v3
Plugging in the numbers and re-arranging for v3 gives
100020+10000=2000*v3
v3=(1000*20)/2000=10m/s
AH
Related Physics GCSE answers
All answers ▸Hanging on a branch of a tree, a monkey sees a hunter aiming a gun at him. The monkey lets go of the branch at the exact same time the bullet is fired. Explain why the bullet hits the monkey.
How do Transformers work?
Two identical objects have a charge of magnitude q. If r is the distance bethween them, what should their mass be so that the objects are balanced.
Describe the forces acting on an object on earth falling through the air, and how they change from when the object is first released into the air leading to terminal velocity.