Question

was the velocity of the bus
4. Calculate the momentum of a body of mass 450 g moving with a speed of 120 km/h.
5. A bullet of mass 20 g travelling with a velocity of 20 m/s penetrates a sand bag and comes to rest in
0.05 second. Find a) the distance through which it penetrates b) retarding force.​

Answer 1

Answer:

4) 54 kgwt

5) s=15m

F=0.8N

Explanation:

4) momentum p=mv

=120*0.45

=54kgwt

5) v=u+at

0=20+a(0.5)

a=-20/0.5

a=40m/s²(in opposite direction of motion

s=ut+1/2at²

=20(0.5)+1/2(40)(0.5)²

=10+5

=15m

F=ma=F retarding (as the body come to rest)

F=0.02*40

=0.8N

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