Question

contact time is (1/50) sec. Find the average force applied on the body by the wall. (Ans: - 20000 N) 3.A ball of mass 0.2 kg moves with a velocity of 20 m/s and if it stops in 0.1 sec due toamiform retardation,ther how much is the retarding force on the well? (Ans: 40 N)​

Answer 1

Given,

• m= 0.2 kg.
• v = 20 m/s,
• t = 0.1s

$\pmb{\sf \: F=ma= \dfrac{mΔv}{Δt}}$

$\sf{∴f= \pmb{0.2×\dfrac{20}{0.1}=40N}}$

Answer 2

Answer:

F=ma=m(

t

υ−u

)=

t

−mu

Substituting the values and neglecting the negative sign (because none of the options is negative)

F=

0.1

0.2×20

=40N