Question

A partical of m 50kg is rest.the work done to accelerate it by 20m/s in 10s is?

Answer 1

m=50kg
a=20m/s
t=10s
s=u+1/2at^2
s=0+1*20*10*10/2
s=50*20
s=1000m
W=F.s
w=m*a*s
w=50*20*1000
w=5*2*10^5
w=10*10^5
w=10^6 joule ans