Question

A boy throws a ball 60 degree to the horizontal along a road with speed of 10 m /s (36km/h) . Another boy sitting in a passing by car observes the ball sketch the motion of phthe ball as observed by the boy in the car , if car has a speed of 18km/h . Give explanation to support your digram

Answer 1

Answer:

Let the each half of the running time be t.

During first half time, speed of car is 80 km/h

Distance covered d

1

=80t km

During second half time, speed of car is 40 km/h

Distance covered d

2

=40t km

Total distance covered d=d

1

+d

2

=80t+40t=120t

Total time taken T=2t

Average speed v

avg

=

T

d

=

2t

120t

=60 km/hr