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A body os projected up with inital velocity u m/s . it goes up to height h meter in time t second.Then it comes back at projection point .consider negligible air resistance,which is true? 1.acceleration is 0. 2.displacement is 0. 3.average velocity is 2h/t. 4.final velocity is 2u at projection point

A body os projected up with inital velocity u m/s . it goes up to height h meter in time t second.Then it comes back at projection point .consider negligible air resistance,which is true? 1.acceleration is 0. 2.displacement is 0. 3.average velocity is 2h/t. 4.final velocity is 2u at projection point

Grade:9

1 Answers

Kamakshya Pruseth
12 Points
4 years ago
answer is 2. displacement is 0 as it reaches the point it was projected from
why other options are wrong:
1.accerelation under freefall is always g which is equal to 9.8 meters per second square.
3.average speed is 2h/t but as velocity is a vector quantity , velocity will be 0.
4.final velocity at projection point would be root over 2gh – u(square). thiss can be obtained by reaaranging v(square)-u(square)=2gh

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