A 110 g ball of clay is thrown horizontally with a speed of 11.0m/s toward a 950 g block resting on

题目

A 110 g ball of clay is thrown horizontally with a speed of 11.0m/s toward a 950 g block resting on a frictionless surface.It hits the block and sticks.The clay exerts a constant force on the block during the 8.00 ms it takes the clay to come to rest relative to the block.After 8.00 ms,the block and the clay are sliding along the surface as a single system.
1.What is the force of the clay on the block during the collision?
2.What is the force of the block on the clay?

答案

水平面上的动量守恒问题,先求出共同速度,再利用动量定理求解.
m1v1=(m1+m2)V
for the ball:Ft=m1v1-m1V
wo yun dao!ni laowai