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Questions  

 A particle is projected horizontally as shown in fig. g=10m/s2. The values of time of flight and range are

a
The time of flight of the projectile along the inclined plane is 2.31sRange of the projectile along the inclined plane is 53.33m
b
The time of flight of the projectile along the inclined plane is 23.1sRange of the projectile along the inclined plane is 23.33m
c
The time of flight of the projectile along the inclined plane is 2.99sRange of the projectile along the inclined plane is 23.33m
d
The time of flight of the projectile along the inclined plane is 23.1sRange of the projectile along the inclined plane is 53.33m

detailed solution

Correct option is A

time of flight for a body that is projected down the inclined plane=T=2usin⁡(α+β)gcos⁡βhere angle of projection wrt horizontal =α=0∘;anglel made by the inclined plane wrt horizontal = β=300;acceleration due to gravity=g=10m/s2;substitute given values in above equationT=(2)(20)sin⁡30∘(10)cos⁡30∘=2.31srange=R=u2gcos2⁡β[sin⁡(2α+β)+sin⁡β]   ; here u= initial velocity of the body projectedα=0∘R=(20)2[sin⁡30∘+sin⁡30∘(10)cos2⁡30∘=53.33m

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