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Answer:
1400 N
Explanation:
Change in momentum equals impulse which is a product of force and time
Change in momentum is given by m(v-u)
Equating this to impulse formula then
m(v-u)=Ft
Making F the subject of the formula then
![F=\frac {m(v-u)}{t}](https://tex.z-dn.net/?f=F%3D%5Cfrac%20%7Bm%28v-u%29%7D%7Bt%7D)
Take upward direction as positive then downwards is negative
Substituting m with 0.3 kg, v with 2 m/s, and u with -5 m/s and t with 0.0015 s then
![F=\frac {0.3(2--5)}{0.0015}=1400N](https://tex.z-dn.net/?f=F%3D%5Cfrac%20%7B0.3%282--5%29%7D%7B0.0015%7D%3D1400N)
Explanation:
Given:
v₀ = 0 m/s
v = 49 m/s
a = 9.8 m/s²
Find: t
v = at + v₀
49 m/s = (9.8 m/s²) t + 0 m/s
t = 5 s