Question

Paragraph 1. A body of mass 10 kg starting from rest accelerates uniformly to a speed of 30 m/s in 10 s. Brakes are applied and the body stops in next 5 seconds. Answer Question number 19 to 23 on the basis of your understanding of the above paragraph and the related studied concepts. 19. The accelerating force on the body is (a) 30 N (c) 10 N (b) 20 N (d) zero 20. The retarding force on the body is (b) - 30 N (a) - 60 N (c) - 20 N (d) - 10 N 21. The ratio of acceleration to retardation of the body is (a) 2 (c) 3 (b) 1 (d) - 1/2 22. Total distance travelled by the body is (a) 200 m (c) 300 m (b) 225 m (d) 400 m 23. If the car is required to stop in 2 seconds, the braking force required will be (a) 60 N (c) zero (b) - 150 N (d) infinite​

Answer 1

Answer:

Here, `m=10kg,

u=0,

v=30m//s,

t= 10s`

<br> `a=(v-u)/t=(30-0)/10= 3m//s^(2)`

<br> `:.` Accelerating force, `F=ma = 10xx3= 30N`

<br> In the second part, `u=30m//s, v=0, t= 5s`

<br> `a=(v-u)/t= (0-30)/5 = -6m//s^(2)`

<br> `:.` Retarding force `F= ma =10(-6)= -60N`.

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