The driver of a three wheeler moving with a speed of 36km/h sees child standing in the middle of the road and brings his vehicle to rest in 4.0s just in time to save the child. What is the magnitude of average regarding force on the vehicle the mass of threewheeleris 400kgandmass of thedriveris65kg
Answer (1)
10th Jun, 2020
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Initial speed =u=36km/h=10m/s
final speed =v= 0m/s
time t=4sec
Mass of the three wheeler m=400kg
mass of the driver=m'=65 kg
Total mass=400+65=465kg
v=u+at
a=v-u/t
=0-10/4
=-2.5m/s^2
The negative sign indicates that the velocity of the three wheeler is decreasing with time.
F=Ma
=465*-2.5
= -1162.5 N
The negative sign indicates that the force is acting against the direction of motion of the three wheeler.
Hope it helps!!!!
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