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Lakhmir singh solutions
Grade 9 
Physics
Science for class ninth - Subject-Physics
Force and Laws of Motion
Exercise
Question 78
Physics
Science for class ninth - Subject-Physics
Force and Laws of Motion
Exercise
Question 78
Force and Laws of Motion | Exercise
Question 78
A car of mass 2400 kg moving with a velocity of 20 m/s is stopped in 10 seconds on applying brakes. Calculate the retardation and the retarding force.
Mass of the car = 2400 kg
Initial velocity, u = 20 m/s
Final velocity, v = 0 m/s
Time, t = 10s
Retardation, a = (v-u)/t = 2 \mathrm{m/ s^2}
Force = ma = 4800N
Question 78
A car of mass 2400 kg moving with a velocity of 20 m/s is stopped in 10 seconds on applying brakes. Calculate the retardation and the retarding force.
Mass of the car = 2400 kg
Initial velocity, u = 20 m/s
Final velocity, v = 0 m/s
Time, t = 10s
Retardation, a = (v-u)/t = 2 \mathrm{m/ s^2}
Force = ma = 4800N
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