Sec
the same time to reach back in the UdU
59. A car travels 100 km at a speed of 60 km/h and returns with a speed
speed for the whole journey.
TH
60. A ball hits a wall horizontally at 6.0 m s-!. It rebounds horizontally at 4.4 ms. The ball is intu
S
the wall for 0.040 s. What is the acceleration of the ball ?
lo
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Explanation:
Using speed =
Time
Distance
⇒Time=
speed
distance
We have total time =
60
100
+
40
100
=
6
25
Hr
Now, Average speed =
Time
(tot)
Distance
(tot)
=
6
25
200
⇒ Average spped =
25
1200
=48km/h
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