fruit ninja question

hello

how can i make a simple fruit ninja game with construct 2

Look in the FAQ section. There is a post called something with fruit ninja even.

For throwing the objects into the air you can use the physics behavior. Add object and apply impulse or something in that direction.

Fruit ninja isn't a simple game to make.

It is possible, but it will take a lot of work. Especially for creating the sliced fruit effect at the right place and angle you'll need a lot of knowledge on math and sprite-manipulation.

There are some topics on the forum here containing ideas on how to start when trying to create a game like this, you could take a look and see if you are capable to do it (yet).