Lakhmir Singh Solutions Class 9 Physics Solutions for Exercise in Chapter 1 - Motion
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A cyclist is travelling at 15 m/s. She applies brakes so that she does not collide with a wall 18 m away. What deceleration must she have?
Answer:
Initial velocity, u = 15 m/s
Final velocity, v = 0 m/s
Distance, s = 18m
Acceleration, a = ?
Deceleration, \mathrm{v^2-u^2=2as} = 6.25 \mathrm{m/s^2}
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