Question

A 0.311 kg tennis racket moving 30.3 m/s east makes an elastic collision with a 0.0570 kg ball moving 19.2 m/s west. Find the velocity of the tennis ball after the collision.

Answer 1

64.5 m/s west

Step-by-step explanation:

put in on acellus and it was right

Answer 2

37.96 m/s

Step-by-step explanation:

`m_1=mass\ of\ tennis\ racket=0.311\ kg\\m_2=mass\ of\ tennis\ ball=0.057\ kg\\u_1=Initial\ velocity\ of\ tennis\ racket=30.3\ m/s\\u_2=Initial\ velocity\ of\ tennis\ ball=19.2\ m/s\\v_2=Final\ velocity\ of\ tennis\ ball\\v_2=\frac {2m_1u_1+(m_2-m_1)u_2}{m_1+m_2}\quad (elastic\ collision)\\\Rightarrow v_2=\frac {2* 0.311* 30.3+(0.057-0.311)* 19.2}{0.311+0.057}\\\Rightarrow v_2=37.96\ m/s\\\therefore Velocity\ of\ the\ tennis\ ball\ after\ the\ collision\ is\ 37.96\ m/s`