12. A boy of mass 50 kg running 5m/s jumps on to a 20kg trolley
1 answer:
Answer:
4 m/s
Explanation:
Momentum is conserved.
m₁ v₁ + m₂ v₂ = (m₁ + m₂) v
(50)(5) + (20)(1.5) = (50 + 20) v
v = 4
The final velocity is 4 m/s.
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Answer:
b) 7.00
Explanation:
N( t ) = -20( t - 5 )²
dN/ dt = -20 x 2 ( t - 5 )
For maximum N ( depth )
dN/dt = 0
- 40 ( t - 5 ) = 0
t = 5
So at 2 + 5 = 7 .00 am depth of water reaches its maximum.
F=9/5C+32 is the formula for Celsius to Fahrenheit.
Answer:
the ball is travelling very fast and the player can get injured if he doesn't wear gloves
Explanation:
It’s either snow or rain if it’s a riddle sort of.
2.39 Watts roughly since watts is joules per second it’s just 910j/380s
