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  • A boy throws a ball in air at 60^{o} to the horizontal along a road with a speed of 10 m/s. Another boy sitting in a passing by car observes the ball. Sketch the motion of the ball as observed by the bot in the car, if car has a speed of 18 km/h.

A boy throws a ball in air at 60^{o} to the horizontal along a road with a speed of 10 m/s. Another boy sitting in a passing by car observes the ball. Sketch the motion of the ball as observed by the bot in the car, if car has a speed of 18 km/h. Give explanation to support your diagram.

Answers (1)

Given : u=36\; km/h=10\; m/s

u_{x}=u\; \cos 60=5\; m/s

now, in the direction of the ball, the speed of the car is 18\times \frac{5}{18}=5\; m/s

since the horizontal speeds are the same, in the situation of a ball thrown by the boy as soon as the car passes him, they also cover equal horizontal distances.

 Now, when vertical components are considered, u_{y}=u\; \cos 30=5\sqrt{3}\; m/s and the motion of the ball is vertically up-down as seen by the boy.

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