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Selina Solutions Class 9 Physics Solutions for Exercise 2C in Chapter 2 - Chapter 2 Motion In One Dimension
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A body initially moving with a velocity 20m/s strikes a target and comes to rest after penetrating a distance 10cm in the target. Calculate the retardation caused by the target.
Answer:
Given: u=20m/s, v=0, s=10cm or 0.1m We know that;
v^2= u^2 + 2as
(0)2=(20)2
2 (a)(0.1)
0 = 400 + 0.2a
-a = 400/0.2
a = -2000m/s^2
∴ Retardation is 2000m/s^2
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