Question

hey guys tell me the answer very fast then i will mark her or him as brainlest explain step by step​

Answer 1

Explanation:

16. we know that, force = mass *acceleration ...(1)

f=5......m=20kg

put the value of m and f in eqn 1

5/20 =a

1/4 = a

a= 0.25

17. v²-u² =2as

given, v=20 u =0 s=50

20×20= 2×a×50

400/100 = a

a =4

18. F=m* a

a =5

so we assume that initially the object is at rest

u=0

v=at

t= v/a

t= 100/5

t =20s

19.Mass of the boy, m1 = 50 kg

Speed of boy, u1 = 5 m/s

Mass of trolley m2 = 20 kg

Speed of trolley u2 =1.5 m/s

Combined mass of boy and trolley, m = 20+ 50 = 70 kg law of conservation of momentum

m1 u1 + m2 u2 = mv 50 x 5 + 20 x 1.5 = 70 x v

v= 280/7 = 4

hope it will help you

if you are satisfied with the answer then plz mark me as brainliest

Answer 2

Answer:

16 (b)

17(d)

20(c) ok correct answer