Question

A 10 kg body moving with 25 m/s stops in 5 sec after the application of brakes. The force applied by the brakes on the body will be?
A. 20N
B. 30N
C. 40N
D. 50N

Answer 1

Answer:

d.50 N

Explanation:

force= mass x acceleration

first divide 25 m/s by 5 s to get the accelaration

the time 10 kg to get the force applied by the brake

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Answer 2

Answer:

Here, m = mass = 10 Kg

u =initial velocity = 25 m/s

v = final velocity = 0 m/s (brakes applied)

t = time = 5 sec

here, a = acceleration = (v-u)/t

or, a = (0-25)/5 = -5 m/s^2

-ve sign denotes retardation of the body because of brakes applied.

Now, F = m×a = 10×5 N = 50 N

Hence, Force applied by the brakes on the body is 50 N...

Option D is correct...