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A boy throws a ball in air at 60^@ to t...

A boy throws a ball in air at ` 60^@` to the horizontal along a road with a speed of ` 10 m//s` (km //h). Another boy sitting in a passing by car observes the ball. Sketch the motion of the ball as observed by the boy in the car, If car has a speed of (18 km //h). Give ezplanation to support your diagravm.

Text Solution

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Hence, ` theta =60^@, u =10 m//s`
:. Horizontal component v elocity of ball ` u cos thera = 10 cos 60^@ =10 xx 1//2 = 5 m//s`
Horizontal velocity of car
`= 18 km//h`
`=5 m//s`
Sincen the speed of the car is matching with the horizontal speed of the projectile, hence boy sitting in the car will see only vertical motion of the ball, as shown in Fig. 2 (EP).2 20 (b).
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