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A car travels a distance x km with ...

A car travels a distance x km with a speed 36 km / h and another x km with 45 km / h . The average speed of the car is

A

`40.5 km //h`

B

`40 km //h`

C

`42 km//h`

D

dependent on x

Text Solution

Verified by Experts

IF a= angle of projection and u- intial velocity , horizontal component of velocity `= u cos alpha` .
The horizontal component of velocity of a projectille remains unchanged throughout its path but at the topmost point the vertical component of its velocity becomes zero .
Given `, u cos alpha = ( u )/(2) `
or ` cos alpha =1/2 = cos 60 ^@ " or " , a= 60 ^(@)`
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