carlsbadalkalin carlsbadalkalin

23-12-2017
Physics

contestada

While skateboarding at 19 km/h, Alana throws a tennis ball at 11 km/h to her friend Oliver. If Alana is the reference frame, the speed of the tennis ball is km/h.

Respuesta :

andriansp andriansp

23-12-2017

When Alana moving 19km/h, a stationary object will be perceived by her as moving toward her with 19km/h velocity. If the object is not stationary(velocity isn't zero), the speed will increase by the object velocity.

the relative speed of the tennis ball=
the speed of Alana + true speed of the tennis ball
19km/h+ 11km/h= 30km/h

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alanisjuvera10188 alanisjuvera10188

04-03-2019

the answer is 11km/h .. i just took the test.

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